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Representational State Transfer (REST) is an architectural style that defines a set of constraints to be used for creating web services. Web services that conform to the REST architectural style, or RESTful web services, provide interoperability between computer systems on the Internet. REST-compliant web services allow the requesting systems to access and manipulate textual representations of web resources by using a uniform and predefined set of stateless operations. Other kinds of web services, such as SOAP web services, expose their own arbitrary sets of operations. “Database Training”, “DBA Training”, “Oracle DBA”,  “SQL Server”, “Cloud DBA” , “ MySQL DBA Training”, “SQL Server Training”, “MariaDB Training”, “Microsoft Azure”,  “AWS Training”. 

"Web resources" were first defined on the World Wide Web as documents or files identified by their URLs. However, today they have a much more generic and abstract definition that encompasses every thing or entity that can be identified, named, addressed, or handled, in any way whatsoever, on the web. In a RESTful web service, requests made to a resource's URI will elicit a response with a payload formatted in either HTMLXMLJSON, or some other format. The response can confirm that some alteration has been made to the stored resource, and the response can provide hypertext links to other related resources or collections of resources. When HTTPis used, as is most common, the operations available are GET, POST, PUT, DELETE, and other predefined CRUD HTTP methods.

By using a stateless protocol and standard operations, REST systems aim for fast performance, reliability, and the ability to grow, by re-using components that can be managed and updated without affecting the system as a whole, even while it is running.

The term representational state transfer was introduced and defined in 2000 by Roy Fielding in his doctoral dissertation. Fielding's dissertation explained the REST principles that were known as the "HTTP object model" beginning in 1994, and were used in designing the HTTP 1.1 and Uniform Resource Identifiers (URI) standards. The term is intended to evoke an image of how a well-designed Web application behaves: it is a network of Web resources (a virtual state-machine) where the user progresses through the application by selecting links, such as /user/tom, and operations such as GET or DELETE (state transitions), resulting in the next resource (representing the next state of the application) being transferred to the user for their use.  “Database Training”, “DBA Training”, “Oracle DBA”,  “SQL Server”, “Cloud DBA” , “ MySQL DBA Training”, “SQL Server Training”, “MariaDB Training”, “Microsoft Azure”,  “AWS Training”. 

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