Ad (noun)

1. A commercial message in any medium that promotes a product, service, or idea.
2. A notice, such as a poster or a paid announcement in the print, broadcast, or electronic media, designed to attract public attention or patronage.

Origin:

Abbreviation of advertisement.

Examples:

1. He saw an ad for the new car on TV.
2. She placed an ad in the newspaper to sell her car.
3. The ad campaign was successful in boosting sales.
4. The company's latest ad features a celebrity spokesperson.
5. The website is supported by ads, it's how they make money.