Files with a "~" at the end of their names (for example, example.txt~) are automatically created backup copies of documents edited in the gedit text editor or other applications. It is safe to delete them, but there's no harm to leave them on your computer.

These files are hidden by default. If you are seeing them, that is because you either selected ViewShow Hidden Files or pressed CtrlH. You can hide them again by repeating either of these steps.

These files are treated in the same way as normal hidden files. See for advice on dealing with hidden files.