Mods

Mods can refer to a number of things:

Internet slang for moderatorss, people on an Internet discussion forum who can edit or otherwise change the state of other users' comments, similar to (though less powerful than) administrators.
A mod, short for modification, is an add-on to a computer game, usually (but not always) a first-person shooter.
Modifications made to a computer in order to improve its appearance.
A British youth subculture of the 1960s. See Mods (youth movement)