The ear is the organ you use to hear sounds. Your ears catch invisible waves of vibration traveling through the air and transform them into signals your brain can understand. Each ear has three main parts: the outer ear (the part you can see and touch), the middle ear (where tiny bones amplify sounds), and the inner ear (where vibrations become nerve signals). The whole system works like a natural microphone built right into your head.

When you listen carefully to someone, you might lend them your ear or be all ears. If you have a good ear for music, you can easily hear whether notes are in tune or recognize melodies quickly. A musician might learn songs by ear, meaning they figure them out just by listening rather than reading sheet music.

The word also appears in phrases about attention and trust. When you whisper in someone's ear, you're sharing something privately. If advice goes in one ear and out the other, it means someone heard it but didn't really pay attention or remember it. And when something is music to your ears, it's information you're really happy to hear.

Corn and wheat also have ears, which are the parts of these grain plants where the seeds grow clustered together.