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Video on demand (VOD) systems allow users to select and watch video and
clip content over a network as part of an interactive television system.
VOD systems either "stream" content, allowing viewing in real time, or
"download" it in which the program is brought in its entirety to a set-top
box before viewing starts. The latter is more appropriately termed "store
and forward". The majority of cable and telco based VOD systems use the
streaming approach, whereby a user buys or selects a movie or television
program and it begins to play on the television set almost
instantaneously.
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