A scissor jack is a mechanical device used to lift heavy objects, commonly found in automotive applications. It operates by using a scissor-like mechanism that expands and contracts, allowing for vertical lifting. When the handle is turned, the arms of the jack move apart, raising the platform where the load is placed. These jacks are often used to elevate vehicles for maintenance or tire changes. They are compact and portable, making them convenient for roadside assistance. Scissor jacks are typically made of steel or aluminum, providing strength and durability for lifting tasks.