Definition of Advertising

advertise:

1. to tell about or praise ( a product, service, etc.) publicly, as through newspapers, handbills, radio, etc., so as to make people want to buy it;

2. to make known; give notice of;

3. to call the public's attention to.

advertisement:

1. the act of advertising;

2. a public notice or announcement, usually paid for, as of things for sale, needs, etc.

(New World Dictionary, Second College Edition)