Zinc oxide (ZnO) is a white powder that is insoluble in water. It is commonly used in various industries, including cosmetics, pharmaceuticals, and electronics. ZnO is known for its UV-blocking properties, making it a popular ingredient in sunscreens. Additionally, it is used as a pigment in paints and as a filler in rubber products. In the medical field, ZnO is used in ointments to treat skin conditions such as eczema and diaper rash. Overall, zinc oxide is a versatile compound with a wide range of applications.