Thermochromic materials are substances that change color in response to temperature variations. These materials contain special dyes that react to heat, allowing them to shift from one color to another as the temperature rises or falls. This property makes them useful in various applications, such as temperature indicators and novelty items. Common examples of thermochromic materials include thermochromic inks used in products like mood rings and temperature-sensitive mugs. They can also be found in smart textiles that change color based on body heat, enhancing both functionality and aesthetics in clothing and accessories.