Advertising

Advertising is a one-way communication whose purpose is to inform potential customers about products and services and how to obtain them. Every major medium is used to deliver these messages, including: television, radio, movies, magazines, newspapers, video games, the Internet , and billboards. Advertising is often placed by an advertising agency on behalf of a company.

Advertisements can also be seen on the seats of grocery carts, on the walls of an airport walkway, on the sides of buses, heard in telephone hold messages and in-store public address systems. Advertisements are usually placed anywhere an audience can easily and/or frequently access visuals and/or audio.
Some organizations which frequently spend large sums of money on advertising but do not strictly sell a product or service to the general public include: political parties, interest groups, religion-supporting organizations, and militaries looking for new recruits. Additionally, some non-profit organizations are not typical advertising clients and rely upon free channels, such as public service announcements.

The advertising industry is large and growing. In the United States alone in 2005, spending on advertising reached $144.32 billion, reported TNS Media Intelligence. That same year, according to a report titled Global Entertainment and Media Outlook: 2006-2010 issued by global accounting firm PricewaterhouseCoopers, worldwide advertising spending was $385 billion. The accounting firm's report projected worldwide advertisement spending to exceed half-a-trillion dollars by 2010.