A Webcomic is like a normal, print, comic, but on the internet. It's a huge scene on the internet with hundreds of active webcomics building an audience. Video Games are an especially popular hobby to write a webcomic about.
Prominent Video Game Webcomics
Since this IS the Encyclopedia Gamia, here is a list of well known Video Game related webcomics. While there are certainly many, many, popular non-game strips out there, they will not be listed here.