A copyright is a law that gives the owner of a written document, video, composition, book, picture, or other creative work, the right to decide what other people can do with it.
Copyright laws make it easier for authors to make money by selling their works. Because of copyright, a work can only be copied if the owner of the copyright gives permission.
When someone copies or edits a work that is protected under copyright without permission, the owner may sue for the value of the violation.
Read more: https://simple.wikipedia.org/wiki/Copyright