化粧水, or "toner," is a skincare product commonly used after cleansing the face. It helps to hydrate the skin, balance its pH levels, and prepare it for further treatments like serums and moisturizers. Many formulations include ingredients like hyaluronic acid or glycerin to enhance moisture retention. In addition to hydration, 化粧水 can also contain antioxidants and botanical extracts that provide additional benefits, such as soothing irritation or improving skin texture. It is typically applied with a cotton pad or by patting it directly onto the skin with clean hands.