A request for Proposal is a procurement document in which the company specifies the nature and scope of the project and lists down all the potential items or services required for the project and sends it to the suppliers. Whereas, the suppliers review the solicitation and submit their suggestions and propose a bid afterward.
This process is helpful when you do have not solid information about the required services or goods, and yet you want to discover the best practice to fulfill your project requirement. The RFP proposed by BusinessBid