Any rescorces for learing about Manifold Pressure?

I have been looking all around the internet trying to find exactly what manifold pressure is, does and why we have it. Any resources suggestions?

This is a good article:

But in essence, you have to think of MP as the “relative pressure” of the fuel-air mixture inside your engine. In other words - think of your engine as a giant vacuum pump (aka the pistons). That giant pump is sucking in air. What’s the pressure that the air is under when it’s sucked in and mixed with the fuel? Low or high? How does it depend on throttle setting? That’s what MP is all about.

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