Say you put a pump in the middle of a huge swimming pool, it will create a flow of water around the pump. The water won’t really be at a higher pressure than the rest of the pool though.
Now suppose you put the pump in a pipe. The pressure is there. So it can’t be the pump alone that creates the pressure. The pipe must be doing something.
On the other hand, if you *just* had the pipe with no pump, the pressure wouldn’t be there. So really it’s a bit of both.
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