A web service is a collection of open protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer. This interoperability (e.g., between Java and Python, or Windows and Linux applications) is due to the use of open standards (XML, SOAP, HTTP).

- The message parameter in the WSDL definition is used to define the different data elements for each operation performed by the web service. So in the example above, we have 2 messages which can be exchanged between the web service and the client application, one is the "TutorialRequest", and the other is the "TutorialResponse" operation. The TutorialRequest contains an element called "TutorialID" which is of the type string. Similarly, the TutorialResponse operation contains an element called "TutorialName" which is also a type string.

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Web services are a type of internet software that use standardized messaging protocols and are made available from an application service provider’s web server for use by a client or other web-based programs. Web services can range from major services such as storage management or customer relationship management (CRM) down to much more limited services such as the furnishing of a stock quote or the checking of bids for an auction item. The term is sometimes also referred to as application services.
In addition to looking up a domain by IP, Whois lookup can also help you validate your website code with one of several Domain and SEO tools including CSE HTML validator, W3C HTML validator and the CSS Validator. Each WhoIs tool identifies errors in your source code so that you can fix things like missing closing tags, errors in character encoding and more. No matter what DNS information you are looking for, WhoIs can help you identify anything related to domain names quickly and easily.
A developer using a top-down model writes the WSDL document first and then uses a code generating tool to produce the class skeleton, to be completed as necessary. This model is generally considered more difficult but can produce cleaner designs and is generally more resistant to change. As long as the message formats between the sender and receiver do not change, changes in the sender and receiver themselves do not affect the Web service. The technique is also referred to as contract first since the WSDL (or contract between sender and receiver) is the starting point.[6]
A directory called UDDI (Universal Description, Discovery, and Integration) defines which software system should be contacted for which type of data. So when one software system needs one particular report/data, it would go to the UDDI and find out which other systems it can contact for receiving that data. Once the software system finds out which other systems it should contact, it would then contact that system using a special protocol called SOAP (Simple Object Access Protocol). The service provider system would first validate the data request by referring to the WSDL file, and then process the request and send the data under the SOAP protocol.
Registration of a domain does not automatically imply the provision of DNS services for the registered domain. Most registrars do offer DNS hosting as an optional free service for domains registered through them. If DNS services are not offered, or the end-user opts out, the end-user is responsible for procuring or self-hosting DNS services. Without DNS services for the domain, the registration is essentially useless for Internet services, although this situation is often encountered with domain parking and cybersquatting.

In addition to looking up a domain by IP, Whois lookup can also help you validate your website code with one of several Domain and SEO tools including CSE HTML validator, W3C HTML validator and the CSS Validator. Each WhoIs tool identifies errors in your source code so that you can fix things like missing closing tags, errors in character encoding and more. No matter what DNS information you are looking for, WhoIs can help you identify anything related to domain names quickly and easily.
Sorry Jezelll, had to throw a downvote. This is not what I would consider 'plain english' :( I don't have a problem with the intent of your definition, but using words like 'operation', 'remote server', 'invoked' and 'specification' makes it hard for beginners to understand. See Mitchel Sellers answer as an example of 'plain english'. – Dhaust Jun 30 '09 at 23:53
^ Mockapetris, P.V. (November 1987). "Domain names - concepts and facilities" (HTML). IETF Documents. IETF. doi:10.17487/RFC1034. Retrieved 24 July 2017. Relative names are either taken relative to a well known origin, or to a list of domains used as a search list. Relative names appear mostly at the user interface, where their interpretation varies from implementation to implementation, and in master files, where they are relative to a single origin domain name. The most common interpretation uses the root "." as either the single origin or as one of the members of the search list, so a multi-label relative name is often one where the trailing dot has been omitted to save typing.
The term Web services describes a standardized way of integrating Web-based applications using the XML, SOAP, WSDL and UDDI open standards over an Internet protocol backbone. XML is used to tag the data, SOAP is used to transfer the data, WSDL is used for describing the services available and UDDI is used for listing what services are available. Used primarily as a means for businesses to communicate with each other and with clients, Web services allow organizations to communicate data without intimate knowledge of each other's IT systems behind the firewall. 

Web services are almost like normal a web page. The difference is that they are formatted to make it very easy for a program to pull data from the page, to the point of probably not using any HTML. They generally also are more reliable as to the consistency of the format, may use a different formal process to define the content such soap or raw xml, and there is often also a descriptor document that formally defines the structure for the data.
Synchronous or Asynchronous functionality- Synchronicity refers to the binding of the client to the execution of the service. In synchronous operations, the client will actually wait for the web service to complete an operation. An example of this is probably a scenario wherein a database read and write operation are being performed. If data is read from one database and subsequently written to another, then the operations have to be done in a sequential manner. Asynchronous operations allow a client to invoke a service and then execute other functions in parallel. This is one of the common and probably the most preferred techniques for ensuring that other services are not stopped when a particular operation is being carried out.
Without prejudice to other definitions I would say that a web service is software system that allows for inter-operable machine-to-machine / application-to-application interaction over a network. This generic definitions would also help consider REST architectures to be a web service as they provide similar functionality albeit being an architectural style unlike the SOAP which is a fully defined protocol.

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Web services are a type of internet software that use standardized messaging protocols and are made available from an application service provider’s web server for use by a client or other web-based programs. Web services can range from major services such as storage management or customer relationship management (CRM) down to much more limited services such as the furnishing of a stock quote or the checking of bids for an auction item. The term is sometimes also referred to as application services.
* NTT America endeavors to make the domain name availability search process reliable; however, NTT America does not guarantee availability of domain names or the accuracy or security of the WHOIS system. There are several factors that could cause a WHOIS.NET query to incorrectly display that a currently registered domain is available. Regardless, if a domain name is already registered, WHOIS.NET will not be able to register the domain or gain possession of the registration from the current registrar without the permission of the current owner. The registration process is not complete until the domain name requested by you has been registered in your name with the appropriate registry. Because there are delays in the actual registration of a domain name with the appropriate registry, NTT America is not responsible if domain names requested by you are actually registered to third parties. Registration of the domain name through NTT America is not complete until you receive the final confirmation e-mail from NTT America. All registrations through NTT America are subject to NTT America's Global Terms and Conditions.
Web services allow different organizations or applications from multiple sources to communicate without the need to share sensitive data or IT infrastructure. All information is instead shared through a programmatic interface across a network. This interface can then be added to a GUI, like a web page, to deliver specific functionality to users. Due to this, web services are not specific to one programming language or operating system and do not require the use of browsers or HTML.
Loosely Coupled – Loosely coupled means that the client and the web service are not bound to each other, which means that even if the web service changes over time, it should not change the way the client calls the web service. Adopting a loosely coupled architecture tends to make software systems more manageable and allows simpler integration between different systems.
SOAP is known as a transport-independent messaging protocol. SOAP is based on transferring XML data as SOAP Messages. Each message has something which is known as an XML document. Only the structure of the XML document follows a specific pattern, but not the content. The best part of Web services and SOAP is that its all sent via HTTP, which is the standard web protocol.
You can find out if a domain name is available by searching at the top of this page. If the domain name you want is not available, try selecting a suggested alternative that appears or searching again. If you’re still stuck, our free guide, Bringing your business online: How to choose a domain name and more, provides some more in-depth information about domain names and helps guide you through the process.
A web service always hides the internal complexity of the service to its clients. For an example, an airliner which is selling tickets via a third party portal is only gathering end user info via a web service and in return it is providing ticket. The portal which is selling ticket doesn't have to bother about the internal complexity of the airlines ticket reservation systems.
A directory called UDDI (Universal Description, Discovery, and Integration) defines which software system should be contacted for which type of data. So when one software system needs one particular report/data, it would go to the UDDI and find out which other systems it can contact for receiving that data. Once the software system finds out which other systems it should contact, it would then contact that system using a special protocol called SOAP (Simple Object Access Protocol). The service provider system would first validate the data request by referring to the WSDL file, and then process the request and send the data under the SOAP protocol.
You'll receive a WhoisGuard subscription absolutely FREE with every eligible domain registration or transfer. WhoisGuard subscription expiration is based on purchase date rather than activation date. WhoisGuard provides subscription pursuant to its Services Agreement with Namecheap. Terms and conditions apply. Visit the WhoisGuard page for details.
Web services are almost like normal a web page. The difference is that they are formatted to make it very easy for a program to pull data from the page, to the point of probably not using any HTML. They generally also are more reliable as to the consistency of the format, may use a different formal process to define the content such soap or raw xml, and there is often also a descriptor document that formally defines the structure for the data.
* NTT America endeavors to make the domain name availability search process reliable; however, NTT America does not guarantee availability of domain names or the accuracy or security of the WHOIS system. There are several factors that could cause a WHOIS.NET query to incorrectly display that a currently registered domain is available. Regardless, if a domain name is already registered, WHOIS.NET will not be able to register the domain or gain possession of the registration from the current registrar without the permission of the current owner. The registration process is not complete until the domain name requested by you has been registered in your name with the appropriate registry. Because there are delays in the actual registration of a domain name with the appropriate registry, NTT America is not responsible if domain names requested by you are actually registered to third parties. Registration of the domain name through NTT America is not complete until you receive the final confirmation e-mail from NTT America. All registrations through NTT America are subject to NTT America's Global Terms and Conditions.
The gaining Registrar must obtain express authorization from either the Registered Name Holder or the Administrative Contact. A transfer may only proceed if confirmation of the transfer is received by the gaining Registrar from one of these contacts. The authorization must be made via a valid Standardized Form of Authorization, which may be sent e.g. by e-mail to the e-mail addresses listed in the WHOIS. The Registered Name Holder or the Administrative Contact must confirm the transfer. The new registrar starts electronically the transfer of the domain with the help of the authentication code (auth code).
The gaining Registrar must obtain express authorization from either the Registered Name Holder or the Administrative Contact. A transfer may only proceed if confirmation of the transfer is received by the gaining Registrar from one of these contacts. The authorization must be made via a valid Standardized Form of Authorization, which may be sent e.g. by e-mail to the e-mail addresses listed in the WHOIS. The Registered Name Holder or the Administrative Contact must confirm the transfer. The new registrar starts electronically the transfer of the domain with the help of the authentication code (auth code).
In addition to looking up a domain by IP, Whois lookup can also help you validate your website code with one of several Domain and SEO tools including CSE HTML validator, W3C HTML validator and the CSS Validator. Each WhoIs tool identifies errors in your source code so that you can fix things like missing closing tags, errors in character encoding and more. No matter what DNS information you are looking for, WhoIs can help you identify anything related to domain names quickly and easily.
The end user verifies that the whois admin contact info is correct, particularly the email address; obtains the authentication code (EPP transfer code) from the old registrar, and removes any domain lock that has been placed on the registration. If the whois information had been out of date and is now updated, the end-user should wait 12–24 hours before proceeding further, to allow time for the updated data to propagate.
If you are looking for a domain, WhoIs domain lookup can tell you if it's already owned by another entity and provide contact information for the domain name owner. WhoIs domain information can help you determine the proper contact for any domain listed in the Whois database. A WhoIs lookup identifies the administrator contact information, billing contact and the technical contact for each domain name listing or IP in the WhoIs database. A WhoIs IP search can also help you potentially determine the source of spam and other details related to a website.
In addition to looking up a domain by IP, Whois lookup can also help you validate your website code with one of several Domain and SEO tools including CSE HTML validator, W3C HTML validator and the CSS Validator. Each WhoIs tool identifies errors in your source code so that you can fix things like missing closing tags, errors in character encoding and more. No matter what DNS information you are looking for, WhoIs can help you identify anything related to domain names quickly and easily.
* NTT America endeavors to make the domain name availability search process reliable; however, NTT America does not guarantee availability of domain names or the accuracy or security of the WHOIS system. There are several factors that could cause a WHOIS.NET query to incorrectly display that a currently registered domain is available. Regardless, if a domain name is already registered, WHOIS.NET will not be able to register the domain or gain possession of the registration from the current registrar without the permission of the current owner. The registration process is not complete until the domain name requested by you has been registered in your name with the appropriate registry. Because there are delays in the actual registration of a domain name with the appropriate registry, NTT America is not responsible if domain names requested by you are actually registered to third parties. Registration of the domain name through NTT America is not complete until you receive the final confirmation e-mail from NTT America. All registrations through NTT America are subject to NTT America's Global Terms and Conditions.
You'll receive a WhoisGuard subscription absolutely FREE with every eligible domain registration or transfer. WhoisGuard subscription expiration is based on purchase date rather than activation date. WhoisGuard provides subscription pursuant to its Services Agreement with Namecheap. Terms and conditions apply. Visit the WhoisGuard page for details.
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