A guest customer typically refers to someone who makes a one-time or occasional purchase from a business without creating an account or establishing a long-term relationship. They may buy products or services without registering for an account or providing personal information beyond what is necessary for the transaction. Guest customers often opt for this option to save time or because they don't plan on making repeat purchases. Businesses may offer guest checkout options to streamline the purchasing process and cater to the needs of these customers.