Copyrights give the creator of an original work exclusive rights to it for a limited time. Copyright is literally "the right to copy," but it also includes the right to be credited for the work, to determine who may adapt the work to other forms, who may perform the work, who may financially benefit from it and other related rights. Wondering if you can use a copyrighted work? Check the blog on that. Likewise if you want to copyright your own work.