Whether it be simple retouches to create-a-sim (CAS) items or brand new gameplay mechanics, there's a talented online community of modders creating new, often free, additions to the game. Since the first game's original release, mods and CC have been incorporated in The Sims and have only continued to grow in popularity.
Many modern games encourage players to enhance their in-game experience by creating unique custom content (or CC), and The Sims 4 is no exception.