A trademark is a word, phrase, symbol, and/or design that identifies and distinguishes the source of the goods of one party from those of others. A service mark is a word, phrase, symbol, and/or design that identifies and distinguishes the source of a service rather than goods. Think brand names, slogans, and logos. The term "trademark" is often used to refer to both trademarks and service marks. Unlike patents and copyrights, trademarks do not expire after a set term of years. Instead, a trademark can last forever, so long as the owner continues to use the mark in commerce to indicate the source of goods and services.