Internet Protocol Television (IPTV)

What is IPTV, how does it work, and where it is going? Will IPTV replace the normal satellite, cable, and terrestrial television and how will High Definition Television (HDTV) play in their futures? IPTV is a fairly recent IT development that seems to be exploding onto the scene. How hard is it for a company to enter into the IPTV marketplace? How will IPTV affect the television and motion pictures industries? IPTV related businesses and companies are literally sprouting up everywhere. Traditional television businesses and television broadcast companies have already joined the IPTV frenzy, or they are scrambling to get into the IPTV marketplace.