A temperature sensor is a device that can sense temperature and convert it into a usable output signal. Based on the working principle, temperature sensors can be categorized into the following types: thermocouples, thermistors, and integrated temperature sensors. In terms of application, sensors used in home appliances and automobiles are typically inexpensive, produced in large quantities, low in cost, and have minimal differences in performance. In contrast, temperature sensors used in industrial applications can vary significantly in performance and price because the accuracy of these sensors is directly related to product quality and the control process, making them generally more expensive.