What is it called and how do I get it on my screen?

I have the iPhone 5. There's this thing that I don't know what it's called and my friends have it on their screen. It's like this button thing that you can drag around your screen. What is it called and how do I get it on my screen.

I think you are talking about the touch assist. Settings > General > Accessibility > AssistiveTouch > On

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