Liquids undergo cohesion because it requires a certain amount of force to separate the molecules of a liquid. This force is less in some liquids such as water, but it is greater in other liquids like honey. Liquids also undergo adhesion. We notice this when we dip a glass rod in a bowl of water. When we remove the glass rod, some of the water adheres to the rod.
Cohesion is usually smaller in liquids than in solids.
Cohesion is greater for some liquids than adhesion, while for other liquids it is the reverse case. For water, adhesion is much greater than the cohesive forces keeping the water molecules together. This is why the water comes away on the glass rod. For mercury, however, cohesion is the greater of the two forces. If a glass rod is dipped into a bowl of mercury, the glass rod will come out clean, and the mercury will not adhere to the glass in favor of bonding to other mercury molecules.