[tracy d]

...does it do, and does it work? specifically for the pc

[Dev0115]

Mods= Modifications..So basically some people modify the game maps/ levels, add their own touch to it. Some modifications, take away the safe write. This way you don't need to put the cd into the cd-rom to play it.

EDIT: Certain reference removed.

[BlueEew]

They are like changing the games, almost like cheats. However you can add new levels, characters etc. You could make one yourself if you would like to, add your own rules and characters.

In a word Hack the Game, my self i prefer to play the game as the designer intended also many Game designers release add ons / plug ins for there Games, eg The Elder Scrolls 4 Oblivion has many plug ins

[Maria]

Cyberbabe some game designers do encourage modding of there games and provide links for feed back within the game :D

Maria (hug)

[jeystone]

And some game designers will release official expansion packs based on "mods"

[its.sid]

They definitely work and some of them are really awesome , You can find a lot of mods for CS and many other games , mods basically are made 2 do things to add some more features to the game , or to add some extra levels in game .