Suction cup

A transparent suction cup
A figure showing that the pressure exerted outside the suction cup exceeds the pressure inside. This pressure difference holds the suction cup in contact with the surface.
The pressure on a suction cup, as exerted by collisions of gas molecules, holds the suction cup in contact with the surface.
One cup suction lifter.

A suction cup, also known as a sucker, is a device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum.

Suction cups occur in nature on the bodies of some animals such as octopuses and squid, and have been reproduced artificially for numerous purposes.

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