What's going on with this website? When I click the link I end up in an app but I have no such app installed on my phone (Android). I've never seen this before.

What's going on with this website? When I click the link I end up in an app but I have no such app installed on my phone (Android). I've never seen this before. It's not AMP and there's no URL bar. It also transitions in a way that normally only happens when you go from the browser to an app.