Copyrights allow people like painters, musicians, writers, and software developers to have some control over how their work is used or shared with others.
Trademarks allow people like clothing and product designers to protect their product's reputation. After all, their products have a good reputation because of all the money and effort these people invested in them.
Patents help people protect their new technological innovations. The person who comes up with the technology for the world's first time travel machine will certainly want to get some credit for it!
There's one thing we need to tell you: the information in this tutorial should not be thought of as legal advice. If you have specific questions about the law or whether your item is legal, you should contact a lawyer.