There are several types of trademarks. First, a service mark is the same as a trademark except it promotes a service instead of a product. A certification mark is a symbol, device, or name used by an organization to vouch for products and services provided by another organization. For instance, the seal you see on a book from Oprah Winfrey’s Book Club is a certification mark A collective mark, on the other hand, is a symbol, mark, phrase, or label used by members of an organization to identify goods, members, products, or service they provide. Only members of the particular group or organization are allowed to use the collective mark; even the group itself cannot use a collective mark – just the members of the group.