A car jack is a tool used to lift a vehicle off the ground, making it easier to change a tire or perform maintenance. It works by using mechanical advantage, allowing a small force to lift a heavy object like a car. There are different types of car jacks, including hydraulic jacks and scissor jacks, each designed for specific lifting needs. When using a car jack, safety is crucial. Always ensure the vehicle is on a flat surface and use jack stands for added support. This prevents accidents while working on your car. Having a reliable spare tire and knowing how to use a car jack can save you time and trouble on the road.