All digital cameras have an image sensor to capture information.
The easiest way to understand this sensor is to think of it as the equivalent of a piece of film. When the shutter button on a camera is depressed, light enters the camera and the image is exposed onto the sensor, in the same way that it would have been exposed on to a piece of film in an old 35mm film camera.
DSLR cameras and point and shoot cameras both use two types of image sensors primarily: CMOS and CCD. Click the link to read more about the sensors in cameras and answer the question: What are image sensors?
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