Hidden Content Folder

I was having a problem with not being able to install things because my USB was "too full" yet I had used 6 of 16gb. I looked into what was taking up the space using WizTree, and found that there was a hidden folder called "content" taking up all but 12mb of my drive. I ended up deleting it, and I could install stuff, but what is this folder, and what is it meant for?