What does a trademark protect? 

The look, shape and feel of a product. 

Logos, names and brands. 

An invention. 

A secret formula. 

A work of art. 

Logos, names, and brands.

A trademark primarily protects logos, names, and brands. It distinguishes a particular product or service from others in the market. This means that a trademark safeguards the unique identifiers associated with a company or its products. It does not protect the look, shape, or feel of a product, inventions, secret formulas, or works of art, as those are typically protected by other forms of intellectual property such as design patents, utility patents, trade secrets, or copyrights, respectively.