What is Mod in Toribash?

Ok, well they are the sceranio you play in, If you choose a good one you will see that the whole concept of the game has changed.

If you choose one with extra objects. Than use these objects to improve your skill and knowlege.

Some... "NOObs" if you willl, Created mods that are extremly stupid and idiotic, You can change the mod if you run into one of those.

But for beginners i would suggest playing online, In beginner servers.