HTTP is an acronym that stands for hypertext transfer protocol and is defined as the beginning of most website addresses, used to signal a request to receive or transmit files over the Internet.
An example of HTTP is the first part of the address for YourDictionary, http://www.yourdictionary.com.
See HTTP in American Heritage Dictionary 4
Origin: H(yper)t(ext) T(ransfer) P(rotocol).
Learn more about HTTP