Products Web Progressive Web Apps Training Introduction to Service Worker Service workers are at the core of PWA techniques for resource-caching and push notifications. This video covers what a Service Worker is, what it can do, and the Service Worker lifecycle in the browser. Watch video on YouTube View slides on Google Docs Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 2, 2017.