While a word mark protects your brand name in form of text word only, adding a logo or design mark will protect the style in of your brand name, the way you write it, the letters, numbers, and the image elements. If you register for design mark as well, nobody will be able to copy your logo as well. Almost all major brands register for both, word and design mark. We advise our clients to file from both marks since this offers a complete protection to a brand name.