IPTV means “Internet Protocol Television”.
“From a TV watcher’s point of view, IPTV is very simple: instead of receiving TV programs as broadcast signals that enter your home from a rooftop antenna, satellite dish, or fiber-optic cable, you get them streamed (downloaded and played almost simultaneously) through your Internet connection. You watch the program either on your computer or with a set-top box (a kind of adapter that fits between your Internet connection and your existing television receiver, decoding incoming signals so your TV can display Internet programs).”
Source: Woodford, Chris. (2012/2017) IPTV. Retrieved from http://www.explainthatstuff.com/how-iptv-works.html. [Accessed January 28, 2017]