"Progressive Web App"

https://developer.mozilla.org/en-US/docs/Web/Progressive_web...

Progressive web application - https://en.m.wikipedia.org/wiki/Progressive_web_application

An app that starts out as a web app, but lets you add it to your desktop and it will look just like any other app on your computer. Given that the browser/OS supports it.

A website.

>What is a "PWA?"

Exactly.