Hi anonymous user,
The guest account lets other people use your computer without being able to change PC settings, install apps, or access your private files.
Do note however that Windows 10 no longer offers a Guest account to share your PC, but you can create a restricted account to emulate that kind of functionality.
How to set up a guest account on Windows 10
(If the reply was helpful please don't forget to upvote or accept as answer, thank you)
Best regards,
Leon