Powder in cosmetics refers to a fine, dry substance used to enhance the appearance of the skin. It can help to set makeup, control shine, and provide a smooth finish. Powders come in various forms, including loose and pressed, and can be made from ingredients like talc, mica, or silica. Cosmetic powders are often used for different purposes, such as setting powder to lock in foundation, finishing powder for a soft-focus effect, or blush powder to add color to the cheeks. They are available in a range of shades to match different skin tones and can be applied with brushes or sponges.