Hydrophilic interactions refer to the attraction between water and polar or charged molecules. These interactions occur because hydrophilic substances can form hydrogen bonds with water, allowing them to dissolve or mix easily. Common examples of hydrophilic substances include sugars, salts, and proteins, which are essential for various biological processes. In contrast to hydrophobic interactions, which involve non-polar molecules that repel water, hydrophilic interactions play a crucial role in cellular functions. They help maintain the structure of cell membranes and facilitate the transport of nutrients and waste in and out of cells, ensuring proper cellular activity and homeostasis.