docs: add pwa keyword to service worker page (#25725)

PR Close #25725
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Stephen Fluin 2018-08-29 10:36:15 -07:00 committed by Misko Hevery
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# Angular service worker introduction
Service workers augment the traditional web deployment model and empower applications to deliver a user experience with the reliability and performance on par with natively-installed code.
Service workers augment the traditional web deployment model and empower applications to deliver a user experience with the reliability and performance on par with natively-installed code. Adding a service worker to an Angular application is one of the steps for turning an application into a [Progressive Web App](https://developers.google.com/web/progressive-web-apps/) (also known as a PWA).
At its simplest, a service worker is a script that runs in the web browser and manages caching for an application.