A sensor is a device that detects and measures physical properties from the environment, such as temperature, light, motion, or pressure. It converts these measurements into signals that can be read and interpreted by humans or machines. Sensors are widely used in various applications, including automobiles, smartphones, and industrial equipment. Sensors can be categorized into different types based on their function. For example, temperature sensors measure heat levels, while motion sensors detect movement. These devices play a crucial role in automation, safety systems, and data collection, making them essential in modern technology and everyday life.