A thermistor is a type of temperature sensor made from ceramic materials that exhibit a change in resistance with temperature variations. There are two main types: Negative Temperature Coefficient (NTC) thermistors, which decrease in resistance as temperature increases, and Positive Temperature Coefficient (PTC) thermistors, which increase in resistance with rising temperature. They are widely used in various applications, including temperature measurement, control systems, and circuit protection. Thermistors are commonly found in household appliances, automotive systems, and medical devices. Their sensitivity and accuracy make them ideal for precise temperature monitoring. Additionally, they are often used in conjunction with microcontrollers and other electronic components to create efficient temperature regulation systems.