Let’s start with the basics.
YouTube, now owned by Google, offers one of the best definitions of copyright at its users’ copyright center (“Copyright on YouTube”):
Copyright is a form of (legal) protection provided for original works of authorship, including literary, dramatic, musical, graphic and audiovisual creations. “Copyright” literally means the right to copy, but has come to mean that body of exclusive rights granted by law to copyright owners for protection of their work.
According to the U.S. Patent and Trademark Office:
A trademark is a word, phrase, ...