What are Modifications /Mods

What are Modifications /Mods
Mods as the name says modifications are modification to the program of your game to improve your gameplay. It can be an additional feature, it could  remove an existing feature in the game that most likely annoy players or it could fix some bugs in the game. Example of an additional feature is a mod that allow you to send your teen sims to a new social event which is the prom where you can be a prom queen and get reward after if you are able to accomplish several task during the prom; On the  other hand an example of a mod that removes an existing feature is a mod that removes the zzZ animation while sleeping. Most simmers didn't like that is why this mod is created in the first place. No offense to the game developers, I love them so much for creating such a wonderful game. I'm just explaining how mods work. :)