Dye is a substance used to add color to materials such as fabric, paper, or food. It can be derived from natural sources, like plants and insects, or created synthetically in laboratories. Dyes work by chemically bonding to the material, allowing the color to remain even after washing or exposure to light. There are various types of dyes, including acid dyes, reactive dyes, and direct dyes, each suited for different applications and materials. The dyeing process can involve techniques like immersion, spraying, or printing, depending on the desired effect and the type of material being colored.