Splash screens for Andoid

I know that we can use an image/video as the splash screen for Android apps. For my application, I have not configured any splash screen and even when I toggle to the splash screen section inside the Mobile view I only see a black screen. And even in the Splash Screen properties section, there is nothing selected. Despite this, a default splash screen is shown for my applications and it is like this: It seems like a video, in which we get an Android icon at the start and then the VOLT MX icon also shows up.

So, I want to ask why that is happening.

I assume this is the default behaviour for the apps.