A floor jack is a tool used to lift heavy objects, typically vehicles like cars and trucks, off the ground. It works by using hydraulic pressure to raise the jack, allowing you to access the underside of the vehicle for repairs or maintenance. Floor jacks are essential for tasks such as changing tires or inspecting the brakes, making them a must-have for both professional mechanics and DIY enthusiasts. There are different types of floor jacks, including hydraulic jacks and mechanical jacks. Hydraulic jacks are more common due to their ease of use and ability to lift heavier loads with less effort. Always remember to use jack stands for safety when working under a lifted vehicle.