An advertising agency, often referred to as a creative agency or an ad agency, is a business dedicated to creating, planning, and handling advertising and sometimes other forms of promotion and marketing for its clients.
An ad agency is generally independent from the client; it may be an internal department or agency that provides an outside point of view to the effort of selling the client’s products or services, or an outside firm.
An agency can also handle overall marketing and branding strategies promotions for its clients, which may include sales as well.
Typical ad agency clients include businesses and corporations, non-profit organizations and private agencies. Agencies may be hired to produce television advertisements, radio advertisements, online advertising, out-of-home advertising, mobile marketing, and AR advertising, as part of an advertising campaign.
The first acknowledged advertising agency was William Taylor in 1786. Another early agency, started by James ‘Jem’ White in 1800 at Fleet Street, London, eventually evolved into White Bull Holmes, a recruitment advertising agency, that went out of business in the late 1980s.
In 1812 George Reynell, an officer at the London Gazette, set up another of the early advertising agencies, also in London. This remained a family business until 1993, as ‘Reynell & Son,’ and is now part of the TMP Worldwide agency (UK and Ireland) under the brand TMP Reynell.
Another early agency that traded until recently, was founded by Charles Barker, and the firm he established traded as ‘Barkers’ until 2009 when it went into Administration.
Source : Wiki