Direct dyes are a type of coloring agent used primarily in textiles and hair products. They are known for their ability to bond directly to the material without the need for a mordant, which is a substance that helps fix the dye. This makes them easy to use and ideal for achieving vibrant colors. These dyes are often water-soluble and can be applied in a simple process, making them popular in the fashion industry. However, direct dyes may not be as long-lasting as other dye types, such as reactive dyes, and can fade more quickly with washing and exposure to sunlight.