The function of a sensor in a camera is to convert the light entering the camera lens into an electrical signal. The sensor is comprised of millions of individual light-sensitive pixels that capture the image and color information. These pixels gather photons from the scene being photographed and convert them into an electrical signal. This signal is then processed by the camera's image processor to create a digital image file. The size and quality of the sensor directly impact the image quality, dynamic range, low-light performance, and overall capabilities of the camera. Therefore, a sensor plays a crucial role in determining the overall performance and image quality of a camera.