how to add folders to selected code

I know this question is very simple, but I want to organize my code better, how would I make the little folders to shorten down my code? The little plus, and minuses at the side of the IDE.

#region folder
// Code here
#endregion

It’s a folder I guess?

Yea @wolfhunter777 is the way to go, but only for C# i think.
It’s called code folding btw. Think of it like a peice of paper that your folding to hide the inside of it.