Digital cameras and video cameras use a matrix as a light detector.
In analog cameras, not digital cameras, film is the light receiver. The principle of operation of cameras is basically the same as in digital cameras, but there is also a tape drive mechanism.
Images taken with digital cameras can be transferred to a computer directly from the camera, a photo taken with a film camera must be scanned to transfer to a computer.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.