A mechanical jack is a device used to lift heavy objects, such as cars or machinery, by applying force through a mechanical advantage. It typically consists of a sturdy frame, a lifting mechanism, and a handle that allows users to raise or lower the load. Common types of mechanical jacks include floor jacks, bottle jacks, and scissor jacks, each designed for specific lifting tasks. These jacks are essential tools in various settings, including auto repair shops and construction sites. They help ensure safety and efficiency when lifting heavy items, making it easier for workers to perform repairs or adjustments without straining themselves.