Spray-drying is a process used to convert liquid substances into dry powder. It involves spraying a liquid solution or slurry into a hot air chamber, where the moisture quickly evaporates, leaving behind fine particles. This method is commonly used for food products, pharmaceuticals, and chemicals, as it helps preserve the original properties of the material. The resulting powder can be easily stored and transported, making it a popular choice in various industries. Products like instant coffee, milk powder, and spices often undergo spray-drying to enhance shelf life and convenience for consumers.