H

HDTV

See high-definition television.

head end

The origin of signals in a terrestrial, cable, satellite, or network broadcast system. In Broadcast Architecture, the server infrastructure that gathers, coordinates, and broadcasts data is generally located at the broadcast head end.

high-definition television

(HDTV) Television that is delivered at a higher screen resolution than is provided for by NTSC, PAL, SECAM, or other existing standards.

HTTP

See Hypertext Transport Protocol.

Hypertext Transport Protocol

(HTTP) The underlying, application-level protocol by which Web clients and servers communicate on the Internet. See also File Transfer Protocol.