Aquaporins are specialized proteins found in cell membranes that facilitate the transport of water molecules. They act as channels, allowing water to move in and out of cells efficiently, which is crucial for maintaining proper hydration and cellular function. These proteins are essential in various biological processes, including kidney function and plant water regulation. In humans, aquaporins play a vital role in the kidneys, helping to concentrate urine and regulate water balance. In plants, they assist in water uptake from the soil and its distribution throughout the plant. Overall, aquaporins are key to maintaining water homeostasis in both humans and plants.