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I think that google'ing isn't that hard right? The aperture is the width of the opening before your CCD or CMOS sensor and it defines the amount of light that is entering the camera.
An ideal model makes this a point, leading to a single dot focal point. However, in real situations this aperture can be adapted to get more of less light through at a single shot. It is a camera specific setting, which is in the metadata of most images taken with decent camera equipment.
