The acronym HTTP stands for "Hyper Text Transfer Protocol". It is a protocol or set of rules used for transferring and receiving web pages, documents, and other resources on the World Wide Web. This protocol is responsible for facilitating communication between web servers and clients, such as web browsers. The client sends an HTTP request message to the server, and the server responds with an HTTP response message containing the requested resource. The HTTP protocol is an essential part of the Internet, and it is the foundation upon which the World Wide Web is built.