Progressive Web Apps were covered some months ago in ToW 426, and are seen by many as the next generation of mobile apps. They provide a handy way of meeting the needs of a website suitable for mobile browsers as well as a way of delivering an app-like experience to multiple devices of varying sizes, without needing the developers to target specific platforms individually.
Microsoft published a bunch of 3rd party PWA apps directly into the Microsoft Store (eg start with SkyScanner then click on “Microsoft Store” when opened with the Store app itself rather than the web UI), though there haven’t been any new ones for a while.
Google is also throwing its weight behind PWAs – so much so, that version 70 of the Chrome browser has support for PWAs that can be installed to look like a desktop app on Windows, so when the PWA is running it hides the browser UI and is launched from either within Chrome directly, or from the traditional Windows app UI.
When installed, eg https://app.ft.com, via the Chrome browser, the PWA behaves a lot like a desktop app – it can be found by typing its name on the Start menu, and can be quickly pinned to the Start menu or taskbar.
That said, Edge browser users can treat pretty much any website in that way – if you browse to a PWA or simple page you like, as well as adding it to favourites/toolbars etc, you can pin it to your taskbar or start menu by going to the settings menu in the top right. Otherwise, when opening PWAs in Edge they look and behave the same as in other ways, though the Edge toolbar remains.