Several large advertising agencies, including WPP plc, Omnicom, Publicis Groupe, Interpublic and Dentsu, are among the industry's largest.
It is a global, multibillion-dollar business that connects manufacturers and consumers.
In the United States, there are more than 65,000 advertising agencies employing nearly 250,000 employees with annual revenues of $166.8 billion as of 2014.
[2] For 2017 it was estimated that digital ad sales were first to surpass the TV market.
[2] Trade associations representing parts or all of the advertising industry include: