A retainer is perfect for clients who want their agency to work alongside them to meet their mid- to long-term sales and marketing goals. With a retainer, clients get access to a wide range of design and content services from the agency. A retainer typically runs for 30-days. At the end of it, the retainer gets automatically renewed for the next month, and so on. This way, the client is assured that the time and data they are investing in getting their desired output from their agency, will bear returns. A project is ideal for clients who want the support of their agency on just one deliverable like one brochure or coffee table book.