Definition of Wind Energy

Wind energy is energy from moving air.

Air has mass. When it moves, it has kinetic energy. Kinetic energy is the energy of motion.

How does wind form?
Wind forms when the sun heats one part of the atmosphere differently than another part. The heat warms the air causing it to expand. The heated air has less pressure than cooler air. Air always moves from high pressure to lower pressure. The movement of air is wind.

What is wind energy used for?
Wind energy can be converted into mechanical force or used to generate electricity.