[GaltAdonis]

"...I don’t even know what an “app” is..."

Simply put: An 'App' (short for 'application') is a
computer program that does something.
That 'something' that it 'does' is whatever it
was designed and built to do.

With any luck, it may actually do it.
But no guarantees, of course.

[GingisK]

Oh my! I've been employed writing software since 1972. Is there some reason you think I wouldn't know what an application might be?

The lead-in quote did not come from one of my posts.