A machine is a device that uses energy to perform some activity. The term is derived from the Latin word "machina", which in turn comes from the Greek word "mēkhanē" (μηχανή), meaning "device, engine". Machines can range from simple tools to complex systems.

Key characteristics of a machine:

• Uses Energy: Machines require a power source (e.g., electricity, fuel, human force) to operate.
• Performs a Task: They are designed to do specific jobs, such as lifting, moving, shaping materials, or processing information.
• May Consist of Multiple Parts: Machines often comprise interconnected components that work together.
• Can Simplify Work: Machines are often used to make work easier, faster, or more efficient.

Examples of machines include:

• Simple Machines: Lever, wheel and axle, pulley, inclined plane, wedge, and screw.
• Engines: Internal combustion engine, steam engine.
• Electrical Machines: Electric motors, generators, transformers.
• Electronic Machines: Computers, smartphones, televisions.
• Complex Systems: Automobiles, airplanes, manufacturing robots.

For further reading, consider these resources:

• Merriam-Webster Dictionary - Machine
• Wikipedia - Machine