The TV commercial is generally considered the most effective mass-market advertising format and this is reflected by the high prices TV networks charge for commercial airtime during popular TV events. The annual Super Bowl football game in the United States is known as much for its commercial advertisements as for the game itself, and the average cost of a single thirty-second TV spot during this game has reached $2.7 million (as of 2007).
Virtual advertisements may be inserted into regular television programming through computer graphics. It is typically inserted into otherwise blank backdrops or used to replace local billboards that are not relevant to the remote broadcast audience. More controversially, virtual billboards may be inserted into the background where none existing in real-life. Virtual product placement is also possible.