A more thorough explanation:

A vendor is a person or company that sells goods or services to others. This term is often used in the context of real estate, where a vendor is someone who sells property to a buyer.

For example, if you are looking to buy a house, the person or company that is selling the house is the vendor. They are responsible for providing information about the property, negotiating the price, and completing the sale.

In the case of American Needle, Inc. v. National Football League, the term vendor was used to refer to a company that sold hats and other merchandise featuring the logos of various NFL teams. The court ruled that the NFL teams were not a single entity, but rather separate entities that could compete with each other. This meant that the vendor could not be prevented from selling merchandise featuring the logos of individual teams.

Overall, the term vendor refers to someone who sells goods or services to others. This can include individuals, companies, or organizations, and can apply to a wide range of industries and contexts.