Final answer:
Trademarks can protect unique sounds, specific color combinations and styles, and distinctive shapes and packaging of products, but they do not protect functionality or shapes that are integral to the function of a product.
Step-by-step explanation:
The use of a trademark can be extended in several ways beyond simply a word or logo. Trademarks can indeed be used to protect a distinct sound, such as the unique chime of a particular brand. They are also employed to protect a particular color combination and style that a company uses to distinguish its products. Furthermore, trademarks can cover the protect a distinct shape and packaging of goods, which can be critical for brand recognition. However, trademarks cannot protect a functionality, because they are about form and style, not the actual utility or function of a product. Lastly, a shape that is inherent and essential to the use of a product cannot be registered as a trademark since it serves a functional purpose beyond brand identification.