A floor jack is a mechanical device used to lift heavy objects, typically vehicles, off the ground. It operates using a hydraulic system, which allows for easy lifting with minimal effort. Floor jacks are commonly found in garages and are essential for tasks like changing tires or performing maintenance. There are various types of floor jacks, including hydraulic jacks, bottle jacks, and scissor jacks. Each type has its own design and lifting capacity, making them suitable for different applications. Safety features, such as overload protection, are important to prevent accidents while using a floor jack.