A lever is a simple machine that helps lift or move heavy objects with less effort. It consists of a long bar that pivots on a point called the fulcrum. By placing the fulcrum closer to the load, you can lift heavier items more easily. For example, when using a seesaw, one person can lift another by sitting farther from the fulcrum. Levers come in different types, such as first-class, second-class, and third-class, depending on the arrangement of the load, effort, and fulcrum. Common examples of levers include scissors, crowbars, and wheelbarrows. These tools make work easier by allowing us to apply force more effectively.