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The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, 

hypermedia,  information systems. HTTP is the foundation of data communication for the World

 Wide Web.

Hypertext is a multi-linear set of objects, building a network by using logical links (the so-called

 hyperlinks) between the nodes (e.g. text or words). HTTP is the protocol to exchange or transfer

 hypertext.

The standards development of HTTP was coordinated by the Internet Engineering Task Force (IETF)

 and the Word Wide Web Consortium (W3C), culminating in the publication of a series of Requests 

for Comments (RFCs), most notably RFC 2616 (June 1999), which defines HTTP/1.1, the version of

 HTTP in common use.Http also :

• Special protocol to make request of server on behalf of the user.
• Standard for how messages are transmitted and formatted on the web.
• This term located at the beginning of web site address. (http://.....)

HTTP functions as a request-response protocol in the client-server computing model. A web browser,

 for example, may be the client and an application running on a computer hosting aweb site may be 

the server. The client submits an HTTP request message to the server. The server, which provides
resources such as HTML files and other content, or performs other functions on behalf of the client, 

returns a response message to the client. The response contains completion status information about

 the request and may also contain requested content in its message body.

A web browser is an example of a user agent (UA). Other types of user agent include the indexing 

software used by search providers (web crawlers), voice browsers, mobile apps and other software 

that accesses, consumes or displays web content.

HTTP is designed to permit intermediate network elements to improve or enable communications 

between clients and servers. High-traffic websites often benefit from web cache servers that deliver 

content on behalf of upstream servers to improve response time. Web browsers cache previously 

accessed web resources and reuse them when possible to reduce network traffic. HTTP proxy 

servers at private network boundaries can facilitate communication for clients without a globally 

routable address, by relaying messages with external servers.

HTTP is an application layer protocol designed within the framework of the Internet Protocol Suite. 

Its definition presumes an underlying and reliable transport layer protocol, and Transmission 

Control Protocol 

(TCP) predominates for this purpose. However HTTP can use unreliable protocols such as the User 

Datagram 

Protocol (UDP), for example in Simple Service Discovery Protocol (SSDP).

HTTP resources are identified and located on the network by Uniform Resource Identifiers (URIs)—or,

 more specifically, Uniform Resource Locators (URLs)—using the http or https URI schemes. URIs

 and hyperlinks in Hypertext Markup Language (HTML) documents form webs of inter-linked hypertext 

documents. On the Internet the World Wide Web was established in 1990 by English computer scientist

 and innovator Tim Berners-Lee.