Ash is a fine, powdery residue that remains after the combustion of organic materials, such as wood or plants. It is primarily composed of minerals, including calcium, potassium, and magnesium, which can vary depending on the material burned. Ash is often used in gardening and agriculture as a natural fertilizer, enriching the soil with essential nutrients. In addition to its agricultural uses, ash can also be found in various products, such as soap and glass. Some cultures use ash in traditional cooking methods, like making lye for food preparation. Overall, ash plays a significant role in both environmental and practical applications.