The Sims 4 is still one of the best simulation games available, even years after its release. You can also buy The Sims 4 expansion packs to expand the game. However, these cost money. Thankfully, you can expand The Sims 4 for free using mods and custom content. So, in this article we show you how to install The Sims 4 mods and list the best The Sims 4 mods to try. What Are The Sims 4 Mods and Custom Content? In terms of The Sims 4, mods and custom content (CC) are not the same thing. Mods (sometimes called script mods) means modifications.