video sources: Devices in a home theater system that provide video content (TV or movies), such as DVD players, Blu-ray disc players, VCRs, satellite TV receivers, and digital video recorders.

VoD: Video-on-demand. A service that provides movie rentals online, similar to pay-per-view (but the content is available at any time, rather than at set times). Many cable companies now offer VoD as part of their digital cable services.