An advertising agency is a service business that creates, plans, and handles advertising for its clients. Agencies offer services like strategic planning, creative design, media planning and buying. The first advertising agency was founded in London in 1812. In the US, the first agency opened in 1850 in Philadelphia. Today there are full-service agencies as well as specialized agencies that focus on areas like interactive media, healthcare, or search engine optimization. Large agencies have different departments that each focus on aspects like creative design, account management, media, and production.