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Service Worker is a web platform concept that runs in the browser background for caching, offline behavior, and push-like workflows.
Service Worker matters because service workers can make apps faster and more resilient, but stale caches can also hide broken releases. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Service 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 Service Worker.