Color changing materials are substances that can alter their color in response to external stimuli, such as temperature, light, or pH levels. These materials are often used in various applications, including textiles, coatings, and sensors. For example, thermochromic materials change color when exposed to heat, while photochromic materials react to changes in light intensity. These innovative materials are made using special dyes or pigments that undergo chemical changes when triggered. Researchers are continually exploring new formulations and applications for color changing materials, aiming to enhance their functionality and durability in products like smart clothing and temperature-sensitive packaging.