What is a personal check that the bank guarantees or certifies to be good?

A personal check that the bank guarantees or certifies to be good is known as a certified check. When a bank certifies a check, it verifies that the funds are available in the account and reserves those funds for the payee, ensuring that the check will not bounce. This provides assurance to the recipient that they will receive the specified amount. Certified checks are commonly used in transactions where large sums of money are involved, such as real estate purchases.