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Web Worker is a browser performance concept that runs JavaScript work away from the main UI thread.
Web Worker matters because heavy client-side work can freeze the interface unless it is moved off the main thread. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Web Worker as part of the roads and power for the app. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when local work needs to survive hosting, networks, caching, or production traffic. In practice, name the owner, input, output, failure mode, and proof before relying on Web Worker.