"Copyright is a form of intellectual property.
Intellectual property refers to any intellectual creation, such as literary works, artistic works, inventions, designs, symbols, names, images, computer code, etc."
Intellectual property law exists in order to protect the creators and covers areas of copyright, trademark law, and patents. (pitt.libguides.com/copyright/definitions)

"The term “public domain” encompasses those materials that are not protected by intellectual property laws such as copyright, trademark, or patent laws." (pitt.libguides.com/copyright/publicdomain)