Trademark refers to a recognizable sign, design, or expression which identifies products or services of a particular source from those of others.
The term "trademark" is often used to refer to both trademarks and service marks.
Key characteristics of trademarks include:
1. Distinctiveness - must be capable of distinguishing the goods/services
2. Non-functionality - cannot be essential to the use/purpose of the product
3. Use in commerce - must be used in connection with goods/services
4. Registration - provides stronger legal protection (marked with ®)