These verbs are often confused because they all relate to the senses. The key difference is simple: some are active (you choose to do them), and others are passive (they happen naturally).
Hear is passive — sounds come to you without effort.
Listen is active — you focus your attention on a sound.
Important: We say listen to (not “listen music”).
See is passive — your eyes receive the image.
Look at is active — you direct your eyes toward something.
Watch is active and implies attention over time, especially for something moving.
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