Whats the impact: Water cohesion means that droplets of water can stick together. For example, if you turned on the tap and run your hand under it, your touching thousands of water drops. In the lab we performed, we dropped one droplet of water (with a pipette) onto a penny. We dropped another drop on it and watched the two combine into one. Essentially without water cohesion, if you ran the tap you would feel and see individual water droplets.
Definition: Adhesion is a property that allows water molecules to be attracted to other molecules
Whats the impact: Its essentially the same thing as water cohesion but with different substances. Take water with lemon or lime juice. Adhesion allows the different molecules to mix with each other to make one drink. Without it, if you tried to mix lemon juice with water, it wouldn't mix.