Service Worker Overview Service workers are event-driven scripts that run in a separate thread from the main page, intercepting network requests, managing caches, and enabling offline functionality. Workbox v7.4 (maintained by the Chrome Aurora team) provides a production-ready abstraction over the low-level Cache API and fetch event handling. When to use: Progressive web apps needing offline support, apps requiring push notifications, background data synchronization, app shell caching, network request optimization with static routing. When NOT to use: Simple static sites served from a CDN, s…