Advertising (or advertizing)   is a form of  marketing communication used to promote or sell something, usually a business’s product or service.
Latin, ad vertere means “to turn toward”. The purpose of advertising may also be to reassure employees or shareholders that a company is viable or successful. Advertising messages are usually paid for by  sponsors and viewed via various old media; including mass media such as newspaper, magazines, television advertisement, radio advertisement, outdoor advertising or direct mail; or new media such as blogs, websites or text messages.
Commercial ads seek to generate increased
consumption of their products or services through “branding,” which associates a product name or image with certain qualities in the minds of consumers. Non-commercial advertisers who spend money to advertise items other than a consumer product or service include political parties, interest groups, religious organizations and governmental agencies. Non-profit organizations may use free modes of persuasion, such as a public service announcement.
Modern advertising was created with the techniques introduced with
tobacco advertising in the 1920s, most significantly with the campaigns of Edward Bernays, considered the founder of modern, “ Madison Avenue” advertising.  
In 2015, the world spent an estimate of
US$592.43 billion on advertising. Internationally, the largest (“big four”) advertising conglomerates are  Interpublic, Omnicom, Publicis, and WPP. 
The United States of America (USA), commonly referred to as the United States (U.S.), America, and sometimes the States, is a
federal republic  consisting of 50  statesand a federal district. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico. The state of Alaska is located in the northwestern part of North America and the state of Hawaii is an archipelago in the mid- Pacific. The country also has five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.80 million square miles (9.85 million km 2) and with around 318 million people, the United States is the world’s  fourth-largest country by total area and third-largest by population. It is one of the world’s most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The  geography and climate of the United States is also extremely diverse, and it is home to a wide variety of wildlife. 
The United States is a
developed country and has the world’s largest national economy. The economy is fueled by an abundance of  natural resources and high worker productivity. While the  U.S. economy is considered post-industrial, it continues to be one of the world’s largest manufacturers. The country accounts for 37% of  global military spending, being the world’s foremost economic and  military power, a prominent political and cultural force, and a leader in scientific research and technological innovations.