Water absorption is the process by which materials take in water. This can occur in various substances, including soil, plants, and certain types of fabrics. For example, when soil absorbs water, it helps nourish plants by providing the necessary moisture for growth. In plants, water absorption primarily happens through the roots, where water is drawn from the soil. This absorbed water is essential for photosynthesis and other vital functions. Additionally, materials like sponges can absorb water due to their porous structure, allowing them to hold and release moisture effectively.