Service Worker Lifecycle

The Service Worker Lifecycle refers to the sequence of states a Service Worker goes through from its initial registration to becoming active. The main phases are `installing` (the browser downloads and parses the script), `installed` (the worker is ready to take control), `activating` (the worker takes control from any old versions), and `activated` (the worker is now running and can handle events like intercepting network requests). Understanding this lifecycle is key for debugging service worker behavior.