Does steam have mods for games?

[nightrider1470]

Or do you need to manually download and install outside of steam?

 

[MouthBoy]

The steam workshop allows you to add mods to games that support it, which a lot do now days. Just look at your games on steam and see if the workshop is there for them.

 

[arknor]

Only games with a workshop on steam

Found here

click a mod then hit subscribe and steam installs it