MgSO₄·7H₂O, commonly known as Epsom salt, is a chemical compound made up of magnesium, sulfur, and oxygen. It appears as a white crystalline solid and is often used in various applications, including gardening, health, and beauty. The "7H₂O" indicates that each molecule of magnesium sulfate is associated with seven water molecules, making it a hydrated form of magnesium sulfate. In gardening, Epsom salt is valued for its ability to enhance plant growth by providing magnesium, which is essential for photosynthesis. Additionally, it is used in baths for its potential therapeutic benefits, such as soothing sore muscles and promoting relaxation.