An EPG (electronic program guide) is the on-screen schedule for channel-based viewing - the grid of channels and time slots a viewer browses on linear TV and FAST services. It is what makes "what's on?" answerable when there is no catalog to search, and it is the primary navigation surface for lean-back viewing.
Behind the UI, the EPG is a data pipeline: schedule metadata (often standardized formats) describing each programme's start, duration, title, and rating, kept in sync with the actual playout. Accurate EPG data drives not just navigation but reminders, catch-up, restart-from-start, and ad planning, so schedule drift between the guide and the stream is a real operational problem.
