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 mood rings and temperature-sensitive labels that change color when exposed to heat. They are also found in some types of packaging to indicate whether food or beverages are at the right temperature for consumption.