The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. Hypertext is the type of structured text that uses logical links (hyperlinks) between nodes containing the text. Basically, HTTP is the protocol of exchanging and transferring hypertext.
HTTP functions as a request-response protocol in the client-server computing model. The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and other types of content and other functions for 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 the message body.
In addition to HTTP, there is also the Hypertext Transfer Protocol Secure (HTTPS) - a communications protocol for secure communication over a computer network, with especially wide deployment on the Internet. HTTPS is the result of layering the Hypertext Transfer Protocol (HTTP) on top of the SSL/TLS protocol, adding security capabilities of SSL/TLS to standard HTTP communications.