Quite simply put, these are people who play video games, but on a more consistent basis than most people. It could be said that a gamer is one who makes playing video games a hobby. Do note that a person who is involved with video games as some hobby other than playing (for example, collecting video game memorabilia) would not be considered a gamer.
An elusive creature, the gamer can often be found indoors due to their infatuation with the simulated environment found in video games and their fear of the Wicked Day Star. Handhelds have allowed the gamer to exit their dwellings and journey into the harsh realm that many people refer to as "outside" or real life.