- A JavaScript file that operates as a type of web worker. Service workers work separately from the main browser thread to handle push notifications, synchronize data in the background, cache or retrieve resource requests, intercept network requests, and receive centralized updates. Service workers are used in an attempt to give progressive web apps the ability to provide the high performance and rich experience of native mobile apps, with the low storage space, real-time updates, and improved search engine visibility of traditional web apps. Service workers go through a three-step lifecycle of registration, installation, and activation. ← Wikipedia
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