Mechanical parts are components that work together to create movement or perform a specific function in machines and devices. These parts can include gears, levers, pulleys, and bearings, each designed to transfer force or motion efficiently. They are essential in various applications, from simple tools to complex machinery like automobiles and robots. The design and material of mechanical parts are crucial for their performance and durability. Common materials include metals, plastics, and composites, chosen based on the required strength, weight, and resistance to wear. Proper maintenance of these parts ensures the longevity and reliability of the entire system they are part of.