What is a Service Worker?

Service Workers are a script that runs separately from the page, which provide us with a way to make our sites to work offline, run faster, and add capabilities for background features. With the limits of connectivity, Service Workers provide us with a means to build offline-first capable applications, which will load content for our users, after an initial site visit, regardless of network conditions. Best of all, Service Workers are truly a progressive enhancement, layering on an additional feature to supporting browsers without changing the functionality of our site for users of non-supporting browsers.