if you're asking for shooting games, downloading steam is recommended. There are First-person shooting games, like the half-life 2 series and the Counter-Strike games, and PC versions of Call Of Duty...
Yes, computer games are considered video games, however, they are not. Video games are a console and television and/or handheld playing data from a game cartridge/disc, however, Computer games are...
Well, that's a bit of a weird question; A video game is basically anything not in the real world, it must be played on a screen, rather than the real world