"Red button" interactive TV

Definition
"Red button" interactive TV (ITV) is an

"interactive TV services offered on traditional broadcast digital TV (e.g. satellite TV), with a return-path. Some of classic 'Red Button' functions can even be implemented without a return-path, in which case 'interactivity' is provided by the data pre-pushed to the set-top box (e.g. weather forecasts, EPG)."

Overview
"The 'red button' on the remote control was initially invented by BskyB in the UK and became popular across the board as the entry point to interactive TV services such as Electronic Programme Guides, information services, t-commerce, casual games, etc. The technically limited 'Red Button iTV' differs from the full interactivity offered on two-way broadband networks (online TV or IPTV).