From the United States Patent and Trademark Office (USPTO)"
"A trademark can be any word, phrase, symbol, design, or a combination of these things that identifies your goods or services. It’s how customers recognize you in the marketplace and distinguish you from your competitors.
The word “trademark” can refer to both trademarks and service marks. A trademark is used for goods, while a service mark is used for services.
Identifies the source of your goods or services.
Provides legal protection for your brand.
Helps you guard against counterfeiting and fraud."