a mechanical device that moves fluid or gas by pressure or suction

vacuum pump used to obtain a high vacuum

an air pump operated by hand to inflate something (as a tire)

a vacuum pump that removes gas by ionizing the atoms or molecules and adsorbing them on a metal surface

a vacuum pump that traps gases and vapours by condensing them on a cold surface.

The sorption pump is a vacuum pump that creates a vacuum by adsorbing molecules on a very porous material like molecular sieve which is cooled by a cryogen, typically liquid nitrogen; the typical molecular sieve used is a synthetic zeolite.