A certified check is a type of check that is guaranteed by the issuing bank. It is a form of payment that is more secure than a regular check because the bank has already verified that the funds are available and has set aside the money for the payment. The term 'certified check' can also be used to refer to an AUDIT, which is a process of examining financial records to ensure accuracy and compliance with regulations. An AUDIT is typically conducted by an independent third party and involves a thorough review of financial documents.