MPEG Streams in various flavours are the usual containers for digital TV, radio and video experience.
MPEG-2 Program Stream
Program streams are used to store video on physical discs. e.g. BlueRay/Video DVD/HDV tapes.
MPEG-2 Transport Stream
Transport streams are used for transmissions of channels (and auxcillary data) over networks. It's not unusual to see modern MPEG-4 codecs used in MPEG-2 containers.
Used for unicast and multicast networks like IPTV on DSL networks.