A Request for Quotation (RFQ) is typically used for lower-value, more straightforward purchases and asks only for a price quote. A Request for Proposal (RFP) asks bidders to propose a technical approach and price for more complex work. A formal Tender (Invitation to Bid) is the most regulated process, generally used for higher-value contracts, and follows strict public procurement rules on advertising, briefing sessions, evaluation and adjudication.