The term "hydrophilic" refers to substances that have an affinity for water. These materials can easily interact with water molecules, often dissolving or forming hydrogen bonds. Common examples of hydrophilic substances include sugar, salt, and certain types of proteins. Hydrophilic properties are important in various fields, including biology and chemistry. For instance, in cell biology, hydrophilic molecules help transport nutrients and waste in and out of cells. Understanding hydrophilic interactions is also crucial in developing medications and cosmetics that effectively mix with water-based solutions.