What happens to water if you fill it to the very top of the glass and how is cohesion involved in this phenomenon?

When water is filled to the very top of a glass, it can form a slight dome shape due to cohesion, which is the attraction between water molecules. This cohesive force allows the surface tension to hold the water slightly above the rim of the glass without spilling, as the molecules at the surface are pulled together tightly. If disturbed, the cohesive bonds may break, causing the water to spill over. This phenomenon illustrates how cohesion contributes to the surface tension of liquids.