Service Workers are a JavaScript based proxy written by the devs of PWAs that allow the programmatic control of the cache of your site/origin and are the main driving force in giving web developers the ability to make your websites available offline.
Service Workers are a JavaScript based proxy written by the devs of PWAs that allow the programmatic control of the cache of your site/origin and are the main driving force in giving web developers the ability to make your websites available offline.
Some more great resources to get started: