What does the term hydrophilic refer to?

The term hydrophilic refers to substances that have an affinity for water. This means that hydrophilic substances can interact with water molecules, making them soluble or capable of being wetted by water. This property is crucial in many biological and chemical processes, as it allows hydrophilic materials to dissolve, mix, or react with water.

In the context of beauty therapy, hydrophilic ingredients are often sought after in skincare formulations because they can enhance moisture retention and improve the hydration of the skin. Examples include substances like glycerin and certain sugars, which attract and hold onto water. In contrast, the other options describe characteristics that inherently do not pertain to hydrophilic substances.