What is this window called

Question

It pop up on its side when we write acode

Answer 1

If it's the one that pops up when you execute the code i believe it's called a console.

Answer 2

Your query is editor dependent and doesn't have anything to do with C++, so in order to get an answer, you have to provide more details like, the editor you are using along with the operating system you are running it on and stuff.