Dye plants are natural sources used to produce color for textiles, food, and other materials. These plants contain pigments that can be extracted and applied to various surfaces. Common examples include indigo, which produces a deep blue color, and madder, known for its red hues. Historically, dye plants played a crucial role in the textile industry before synthetic dyes became popular. Many cultures have traditional methods for extracting and applying these natural dyes, often using techniques passed down through generations. Today, there is a renewed interest in dye plants due to their eco-friendly properties and sustainable practices.