Banker's chex, also known as cashier's checks or bank drafts, are a type of check that is guaranteed by the issuing bank. These checks are commonly used for large transactions, such as buying a car or a house, where a personal check may not be accepted. In addition to banker's chex, other synonyms for this type of check include certified check, official check, treasurer's check, and teller's check. Regardless of the name, all of these checks offer a level of security that cannot be found with a personal check, making them a popular choice among buyers and sellers alike.