What is the Radio Nueva Vida application, how does it work?

According to the introduction of Radio Nueva Vida, Radio Nueva Vida is a Entertainment app on the Android platform. There is currently a 3.8.4 version released on Aug 30, 2017, you can see the details below.

Since 1987 Radio Nueva Vida provides the best in Christian music, Bible teaching and messages to build the whole family.
Join us and together praise God 24 hours a day, 7 days a week.

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.