The information is broadcast along with the normal television signal using spare capacity on television channels.

Teletext decoders are standard in televisions these days.

The information is divided into numbered pages, each of which fills a TV screen eg the latest news, the weather forecast, travel news, share prices, TV schedules, etc...

Subtitles for programs are usually broadcast as teletext.

A teletext service generates several hundred pages of information.

The system is non-interactive. ie the user may call up a page of information using a hand-held key-pad, but may not send information back.

The system is free once it has been installed.