Dentsu is a global advertising and marketing agency based in Japan. Founded in 1901, it has grown to become one of the largest advertising networks in the world, providing services in areas such as digital marketing, media planning, and creative development. The company operates in over 145 countries and employs thousands of professionals. Dentsu is known for its innovative approach to advertising, leveraging data and technology to create effective marketing strategies for its clients, which include major brands across various industries.