Whether your business needs a trademark or a copyright largely depends upon what you want to protect.
A trademark protects words, marks, or symbols that identify goods or services offered for sale. The primary business purpose of a trademark is to protect the identity and brand of a product. Some common examples of trademarks include a brand name or a design used on packaging.
A copyright protects an original work of authorship fixed in a tangible medium. Common examples of copyright-able works include songs, movies, books, and photos.