To help avoid accidentally deleting a file, putting something into your Windows Recycle Bin doesn’t actually remove it from your computer. So if you discover you need something you deleted, you can still restore it from the Recycle Bin.  

Or if your computer's hard drive is filling up and you need to make room there, you can permanently remove files by emptying the Recycle Bin.

Read all about how to retore files and empty the recycle bin.