Temporary files; programs generate in the background. Can usually be safely deleted.

Making files accessible to other computers on a network or the internet.

A file that can be viewed but not edited. Helps protect important data from changes.

Settings that control whether a user can view, edit, or execute a particular file.

Encoding data to take up less space. ZIP and RAR are common compressed formats.

Program files your OS needs to function. Best not to tinker with these.

A small file that just points to another file, folder, or program. Handy for quick access.

Having two separate OSes installed, with the ability to choose between them at startup.

The part after the dot in a filename, like .jpg or .mp3, that tells you its format.

Files configured not to show up in regular file browsers. Usually system files.