An ad agency, or advertising agency, is a business that creates, plans, and manages advertising campaigns for clients. These agencies help companies promote their products or services through various media channels, including television, radio, print, and digital platforms. They often conduct market research to understand consumer behavior and develop strategies that effectively reach target audiences. Ad agencies typically employ a team of professionals, including copywriters, graphic designers, and media planners, who collaborate to produce creative content. They may also handle public relations and branding efforts, ensuring that a client's message is consistent across all platforms. Overall, ad agencies play a crucial role in helping businesses grow and connect with consumers.