A service worker is a JavaScript file that acts as a programmable network proxy for your web application. It sits between your browser and the network, intercepting and controlling network requests, effectively giving developers fine-grained control over caching and how resources are fetched. This powerful script runs in the background, separate from the main browser thread, even when the user is not actively on your page. Its core capabilities enable crucial Progressive Web App (PWA) features such as offline functionality by serving cached content, push notifications, and background synchronization. By strategically caching assets and data, service workers allow web applications to provide a fast, reliable, and engaging user experience, even under flaky network conditions or completely offline. More details: http://dezinedepot.com