Advertising is bringing a product (or service) to the attention of potential and current customers. Advertising is focused on one particular product or service. Thus, an advertising plan for one product might be very different than that for another product. Advertising is typically done with signs, brochures, commercials, direct mailings or e-mail messages, personal contact, etc.
There are several reasons for advertising some of which are as follows:
Increasing the sales of the product/service
Creating and maintaining a brand identity or brand image.
Communicating a change in the existing product line.
Increasing the buzz-value of the brand or the company
Thus, several reasons for advertising and similarly there exist various media which can be effectively used for advertising. Based on these criteria there can be several branches of advertising.