Trademarks and service marks are the same in that they both are used by a person or company to distinguish what they have to offer from what other people or companies have to offer. The difference is in how or where the mark appears and what is being offered. Trademarks are used to identify a product or goods, while service marks are used to identify a service performed. Trademarks are usually found on things like the labeling of a product or package, whereas service marks are generally found on a sign, website, or other service-related ads.