When you click the camera the shutter behind the lens of the camera opens briefly and lets in the light on to the film. I am no specialist and this is what I learnt in school.
Light enters your camera by moving your desktop lamp on where your camera is focused at.
The energy that enters any kind of camera through the lens is called light.
An aperture is a hole where light travels through. Therefore in any camera there is always an aperture - including digital cameras - even if it is fixed
Digital camera
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Most digital camera sensors are sensitive to a small range of IR, as well as visible light.
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It focuses the light entering the camera onto the sensor.
The Color of Canon SD890 Digital camera is light blue, pale blue.
Any film camera with a light meter, and every digital camera, has a sensor that will do that.
A digital camera has a surface that it made up of many tiny electronic devices that produce signals when light coming in through the lens falls on them. These signals are recorded inside the camera. A 35mm film camera uses film as that surface. Film changes chemically when touched by light. This film is later removed from the camera and put in a chemical solution that makes it possible to see the image.
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Traditional Photography records light from a camera on to film, digital records the light on to a light sensitive digital CCD that transferrs the image into data and records it as a digital file.