A set-top box (STB), also colloquially known as a cable box and historically television decoder, is an information appliance device that generally contains a TV-tuner input and displays output to a television set and an external source of signal, turning the source signal into content in a form that can then be displayed on the television screen or other display device. They are used in cable television, satellite television, and over-the-air television systems as well as other uses.
Set-top boxes are classified into numerous kinds, ranging from simple units that receive and decode incoming audiovisual signals to complicated systems that provide a variety of services such as videoconferencing, home networking, IP telephony, video on demand, and satellite broadband TV.
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