Fiber-reactive dyes are a type of dye that chemically bond with the fibers of textiles, making them more durable and vibrant. These dyes are commonly used on natural fibers like cotton, linen, and silk, as they create a strong connection that resists fading and washing out. The process of dyeing with fiber-reactive dyes typically involves a reaction between the dye and the fiber in the presence of an alkaline solution. This method allows for a wide range of colors and patterns, making it popular in textile arts and fashion design.