AutoCheck is a vehicle history report service that provides information about used cars. It helps buyers and sellers understand a vehicle's past by offering details such as accident history, title status, and odometer readings. This information can be crucial for making informed purchasing decisions. The service is often used in conjunction with Carfax, another popular vehicle history report provider. By using AutoCheck, potential buyers can assess the reliability and safety of a vehicle, ensuring they are making a sound investment before finalizing a purchase.