A Request for Proposal, or RFP, is a document that companies use to gather information about services from a potential supplier or vendor. These documents are more complicated than RFQs since they ask for more than just a price.
The RFP will provide detail information about the goals and nature of the project that the company needs completed. In addition, it will detail the number of pages and illustrations that the proposal should contain, what laws the project is subject to, and what qualifications the contractors should have. The company may request the proposal to contain other information as well, depending on the project.