agency

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.

View More On Wikipedia.org