Progressive Web Apps (PWA) is a popular software concept introduced in 2015 by Google that brought regular web apps on desktop and mobile to a whole new level. Employing Service Workers, Web App manifest, push-notifications, HTTPS, App Shell, etc., Google’s PWA policies imply these advanced solutions to strictly fit the following standards: Reliable (parts of functionality are available offline); Fast (in PWAs, most part of interactive elements and dynamic content is refreshed on the client-side); Engaging (a PWA provides smooth and inviting user experience). You can create a profitable, user-pleasing PWA solution for your Shopify-based eCommerce store as well. We’ll tell you how, but first, let’s figure out some essentials.