Infrared sensors are devices that detect infrared radiation, which is a type of energy emitted by all objects based on their temperature. These sensors are commonly used in various applications, such as security systems, temperature measurement, and remote controls. They can sense heat from people or objects, making them useful for detecting motion or monitoring environmental conditions. There are two main types of infrared sensors: active and passive. Active sensors emit their own infrared light and measure the reflection, while passive sensors only detect the infrared radiation emitted by objects. This technology is essential in many fields, including automotive safety and home automation.