What is the function button on the keyboard called Insert?

As I understand it when you click Insert. The previously entered text should be replaced by the text entered later. But this is not happening. I have two suggestions on this:
1. I don't fully understand the functionality of this key.
2. Key's not working although there are no prerequisites for this, I also do not see.
June 14th 19 at 20:14
1 answer
June 14th 19 at 20:16
In text editors you need to enable this feature it is disabled by default. You live and learn.
She participates in a little outdated combinations of Ctrl+Ins, Shift+Ins :)
This is probably one of the reasons why it's initially regular behavior in editors was optional. - Adrienne81 commented on June 14th 19 at 20:19
And how do they work? - brandt_Ernser commented on June 14th 19 at 20:22

Sometimes the modern for example, some Android RDP clients have a compact keyboard with these buttons, then you can copy\paste without calling the main keyboard, which closes the split-screen. And so the interest is purely historical. - Adrienne81 commented on June 14th 19 at 20:25

Find more questions by tags KeyboardLayout of the keyboard