"Water soluble" refers to a substance's ability to dissolve in water. When a material is water soluble, it breaks down into smaller particles and mixes evenly with water, creating a solution. Common examples of water-soluble substances include table salt, sugar, and many vitamins like Vitamin C. In contrast, substances that do not dissolve in water are termed "water insoluble." This property is important in various fields, including chemistry, biology, and environmental science, as it affects how substances interact in natural systems and how they are used in products like medications and cleaning agents.