Copyright protects original creative works like writing, art, music, and films from being copied without permission. It applies automatically to any original work as soon as it is created and fixed in a tangible form, unless the creator specifies otherwise. There are several types of licenses people can choose from to share their work, including traditional copyright, public domain, creative commons licenses that allow some sharing and reuse, and copyleft licenses that require derived works to also be shared. Understanding copyright and creative licenses is important so people know how they can legally use and build upon existing creative works of others.