What is the Karekök Video Çözüm application, how does it work?

According to the introduction of FERNUS, Karekök Video Çözüm is a Education app on the Android platform. There is currently a 1.3.0 version released on Aug 05, 2018, you can see the details below.

Karekök Video Çözüm - Karekök Yayınları Video çözüm uygulaması

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.