Vacuum

Because the physical force of vacuum is applied to a common household cleaning utensil, most people think vacuum is 'something that creates suction.' It isn't and doesn't.

Vacuum is 'space without air.' A vacuum cleaner does not 'suck air in.' It creates uneven air pressure by removing air from a canister. Air, then, rushes in through an orifice to fill 'the void of air in the canister.' The air entering the canister is not pulled in; it is actually pushed in by the air behind it.

A more common household item that uses vacuum is the light bulb. Inside the bulb of glass, there is no air. It is essential that there be no oxygen around the filament, because, otherwise, we would have all the necessary elements for 'fire' (ignition, fuel, and oxygen), and the filament (fuel) would last about as long as someone holding the string of a kite if the kite is struck by lightning. When a light bulb breaks, it does not 'explode;' rather, it 'implodes.'

The largest vacuum that is visible to the human eye is in the sky just beyond the atmosphere, a.k.a. space or outer space.

So, why doesn't the air in Earth's atmosphere rush to fill that vast void?

It tries, but the Earth's gravity pulls air particles toward the center of Earth against the vacuum of space. The air within the gravitational pull creates the atmosphere.

That's how powerful gravity is.