A "tool" is any device or implement used to carry out a specific function or task. Tools can be simple, like a hammer or screwdriver, or complex, like a computer or a robotic arm. They are designed to help humans perform work more efficiently and effectively, often enhancing productivity and precision. Tools can be categorized into various types, including hand tools, power tools, and machine tools. Hand tools, such as wrenches and saws, are operated manually, while power tools, like drills and sanders, use electricity or batteries. Machine tools, such as lathes and milling machines, are used in manufacturing to shape materials.