What are the three basic file protection schemes available in UNIX?

The three basic file protection schemes in UNIX are user, group, and others permissions. Each file has an owner (user) who has specific rights, a group associated with the file that can have a different set of permissions, and all other users (others) who may have yet another set of permissions. These permissions dictate the ability to read, write, or execute a file, allowing for fine-grained access control. The permission settings can be modified using commands like chmod to enhance security and manage access.