Copyright protects original works of authorship including writing, music, art, and other creative works. It exists to provide financial incentive for creative works by allowing creators to profit from their work. Anything in a fixed, tangible form is protected by copyright from the moment it is created. Educators can legally use works that are in the public domain, fall under fair use guidelines, or they have permission to use from the creator. Fair use allows limited use of copyrighted works for purposes like teaching without permission as long as it is for a non-profit educational use, only a small portion is used, and it does not harm the market for the original work.