![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Suction_cup_1.jpg/640px-Suction_cup_1.jpg&w=640&q=50)
Suction cup
Device used to adhere to nonporous surfaces / From Wikipedia, the free encyclopedia
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]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Suction_cup_1.jpg/640px-Suction_cup_1.jpg)
![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.](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Suction_cup_pressure_from_collisions.svg/320px-Suction_cup_pressure_from_collisions.svg.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Suction-lifter-one-cup.jpg/640px-Suction-lifter-one-cup.jpg)
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]