"Hydrophilic" refers to substances that have an affinity for water. These materials can easily interact with water molecules, often dissolving or absorbing them. Common examples of hydrophilic substances include sugar, salt, and many types of proteins. Their ability to mix with water makes them essential in various biological and chemical processes. In contrast to hydrophobic substances, which repel water, hydrophilic materials are crucial in many applications, such as in biochemistry and pharmaceuticals. For instance, hydrophilic surfaces can enhance the effectiveness of drug delivery systems by improving the solubility of medications in the body.