What is the name of this gui?

Question

User interface

Hello! Please tell me what is the name of such, say, a gui effect in a Windows program, when the button is pressed, the download icon appears, and then, as if completely different content appears in the same place. For example, as in the VK client on mobile. There was an idea that this is somehow done using visible controls and everything in the world is on the same form, but something tells me that this is not so.
I hope I explained more or less clearly)
Thanks in advance)

Answer 1

Preloading like