The technology pendulum has swung from the web being all the rage to the web being a terrible experience. Now, it's swinging back to the web being all the rage again, thanks to progressive web apps (PWAs), which deliver an app-like experience with the discoverability of the web. This report details what application development and delivery (AD&D) pros need to know about PWAs, in what scenarios PWAs are a better option than a native mobile app, and why it's wrong to build any new web application that's not a progressive web app.