1. Heating Food: This is the most common use of microwaves. Microwaves heat food by exciting water molecules, causing them to vibrate rapidly and generate heat. This is why microwaves are so efficient at cooking food quickly.

2. Communication: Microwaves are used in telecommunications, especially for satellite communication. They can travel long distances with minimal interference, making them ideal for transmitting information.

3. Medical Applications: Microwaves are used in medical imaging techniques like MRI (Magnetic Resonance Imaging) to create detailed images of the inside of the body. They are also used in some types of cancer treatment, such as microwave ablation, where heat from microwaves is used to destroy cancerous tissue.