Suction cup

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.

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

[2] The working face of the suction cup is made of elastic, flexible material and has a curved surface.

The length of time for which the suction effect can be maintained depends mainly on how long it takes for air or water to leak back into the cavity between the cup and the surface, equalizing the pressure with the surrounding atmosphere.

He went on to scale the Renaissance Center in Dallas, the Bonaventure Hotel in Los Angeles, the World Trade Center in New York City, Parque Central Tower in Caracas, the Nippon TV station in Tokyo, and the Millennium Tower in San Francisco.

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.
Suction cup pressed on a window
SatNav devices often ship with suction cup holders for mounting on windscreens.
GoPro camera attached to car with suction cup