There are film Cameras and there are Digital Cameras, the difference is Film Cameras record the image on film which is an emulsion on a base (clear plastic,) and the Digital Camera records the image on a light sensitive sensor after converting the optical image to electrical signals.
The Camera is a light-proof box, light enters only through the lens, as you point your Camera towards a subject light is reflected in a straight line from each point of the subject into the Camera through the Lens Aperture, the lens focuses the image and as you press the shutter button the shutter opens to expose the film or light sensitive sensor to this focused light, the image is now recorded.
There are different types of Cameras, the Point and Shoot fully automatic Camera is the most popular, you point the camera towards the subject look through the Viewfinder or at the LCD, compose your shot then gently press the shutter button,
The Camera automatically sets the Aperture, shutter-speed, focuses on the subject and exposes the film or light sensitive sensor, recording the image.
Some Cameras give you the Option of shooting in automatic mode (Programed), shooting in (Aperture Priority) mode where you choose the Aperture and the Camera selects the shutter-speed, (shutter Priority) mode where you choose the shutter and the Camera selects the Aperture or (Manual) mode where you take full creative control of Aperture, shutter and if you wish, Focus.
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