Question

what is advertising

Answer 1

is the action of calling public attention to something, especially by paid announcements. Note that the definition uses the term 'action of' and doesn't specify that advertising is limited to print media, television, Internet, or any other specific medium. While it does place an emphasis on 'paid announcements,' it isn't a requirement. Finally, it only says that attention is called to something, not specifically good attention. Anyone that has turned on the TV during election season knows advertising can be negative.

Answer 2

The very purpose of giving such information is to promote a product or service and encourage consumers to buy them. This promotional activity.