What 
 Advertisements are the business of drawing public attention to goods and services, performed through a variety of media. It is an important part of a overall promotional strategy. Other components of the promotional mix include publicity, public relations, personal selling, and sales promotion. 
Why
 The purpose of advertising is to convince customers that a company's services or products are the best, enhance the image of the company, point out and create a need for products or services, demonstrate new uses for established products, announce new products and programs, reinforce the salespeople's individual messages, draw customers to the business, and to hold existing customers.
 
How
 Advertising is how a company encourages people to buy their products, services or ideas. An advertisement (or "ad" for short) is anything that draws good attention towards these things. It is usually designed by an identified sponsor, and performed through a variety of media. Ads appear on television, as well as radio, newspapers, magazines and as billboards in streets and cities. They try to get people to buy their products, by showing them the good rather than bad of their products.
For example 
 
 
 Billboards advertise products on city streets. These may simply be freestanding billboards or may be part of street furniture such as a bus shelter. Buses and taxis are often covered in adverts, while budget airlines sometimes allow advertising inside their planes. Adverts also appear in newspapers, magazines and sports programmes. Many stadiums have adverts set around them. Sports teams, tournaments, television programmes and public events sometimes have sponsors.such as to make a burger look tasty in advertising, it may be painted with brown food colours, sprayed with waterproofing to prevent it from going soggy and sesame seeds may be super-glued in place. Advertising can bring new customers and more sales for the business. It can be expensive but can help make a business make more money.
 Therefore advertise is to show something off or tell it to people on a national scale.