What is the Targa version of porsche from 911 turbo, carrera, and convertible?

i know that porsche 911′s got normal one, turbo S, and carrera and convertible.
but i’ve seen one that says Targa 4, what’s the different between them? Does Targa 4 has turbo too?
is there a targa 1, 2, 3,4? what’s the difference between them?

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