What is the EU Login application, how does it work?

According to the introduction of European Union, EU Login is a Business app on the Android platform. There is currently a 1.8.11 version released on Feb 12, 2020, you can see the details below.

The EU Login app is developed by EC DIGIT.D.3 to facilitate your day-to-day authentication. Once you have registered your device with your EU Login account, authentication can be done with just your PIN code when accessing EU Login protected applications using the app via your mobile browser.
EU Login can also be used as a second factor authenticator if an application requires it. Don't have WIFI or Internet access? Don't worry, you can generate a unique code via the QR Code scanner.

The latest version of EU Login mobile includes many technical, usability and stability improvements.