According to the United States Copyright Office, copyright “is a form of protection grounded in the U.S. Constitution and granted by law for original works of authorship fixed in a tangible medium of expression. Copyright covers both published and unpublished works."
Copyright is a form of intellectual property law that “protects original works of authorship including literary, dramatic, musical, and artistic works, such as poetry, novels, movies, songs, computer software, and architecture. Copyright does not protect facts, ideas, systems, or methods of operation, although it may protect the way these things are expressed” (Copyright in General – U.S. Copyright Office).
Video from the United States Copyright Office: "Learn about what copyright involves, including what types of works are subject to copyright protection."