It's the first step in the food chain that sustains every living being on earth. From here the drop may evaporate, trickle into the ocean, or be lapped up by a polar bear. The water drop might fall onto the ground and become surface water. If it winds up being part of the only three percent of surface water on the globe that's fresh rather than salty, it has an important job to do. People, animals, and most plants depend on freshwater.
Folks swim, boat, and fish in freshwater.
Freshwater is also used in industrial processes. Maybe the water drop sinks into the ground and becomes part of the ground water supply. Groundwater fills porous places under the earth, between rocks and soil. It seeps in as if the ground were a sponge. Once under ground, it might settle into an aquifer, which is an underground water system.