The Sims 4 mods cover a wide breadth of content ranging from cosmetic changes to mods that let you tweak individual parameters of how the game runs. It'll list the very best Mods, and give you links to where they can be downloaded.
To help you out, we've put together this The Sims 4 Mods Guide. They can be a lot of fun to use, but with there being so many and all it's easy to get overwhelmed. They allow you to do things not initially intended by the developers of the base game, like adding new hair content, or turning into a vampire.
A great way to put your stamp on a game like The Sims 4 is to use mods.