<human>:  What do I need to know about buying a used car?
<bot>: Before you buy a used car, it's important to make sure you have done your research. Make sure you know the car's background, such as its maintenance and repair history, any damage it has incurred, and how many owners the car has had. It is also wise to have the car inspected by a professional mechanic before you make a purchase. Additionally, you should consider the total cost of ownership including fuel, maintenance and repairs, as well as insurance costs. Lastly, remember to ask questions and take your time to make sure you are making the right decision.