IPTV refers to Internet-based Protocol Television where internet is used to deliver TV programs & Videos that are either live or on demand.
Video on Demand
Near Video on Demand
TV on Demand (TVoD)
With traditional TV, programs are broadcast by being turned into radio waves and beamed through the air to a rooftop antenna on your home. The antenna converts the waves back into electrical signals and your TV set decodes them to make its sound and picture.