Definition
A suction cup is a device that uses vacuum to adhere to a surface. It works by creating a partial vacuum between the cup and the surface, generating enough force to hold the cup in place. Think of it like a tiny, temporary vacuum seal. They're commonly used for mounting things like phone holders or decorations on smooth surfaces. However, their holding power depends on the surface's smoothness and cleanliness; dirt or rough textures reduce suction. Imagine it as a gecko's foot, but man-made and less reliable.