Blowjobs suction

So I've never given a blowjob. Do you actually "suck"? Like suction, like sipping out of a straw. Or is it just an expression? (Sorry if it's a dumb sounding question but you clearly don't "blow" either so...)

and if not, is it mostly about up and down and tongue?

And if so, use tongue swishing too?

And if that as well, is tongue or suction more important?

Thank you :)))

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