CMOS sensors, or Complementary Metal-Oxide-Semiconductor sensors, are a type of image sensor commonly used in digital cameras and smartphones. They convert light into electrical signals, allowing us to capture images. CMOS sensors are popular because they consume less power and can be integrated with other electronic components, making them efficient and compact. These sensors work by using tiny pixels that each detect light. When light hits the sensor, it creates an electrical charge that is processed to form an image. Compared to other sensors, like CCD sensors, CMOS sensors are generally faster and can produce high-quality images even in low light conditions, making them ideal for devices like smartphones and digital cameras.