APA stands for All Points Addressable, also referred to as pixel addressable.
On a monitor, or any form of display device, the dot matrix is the pattern which represents characters, images and symbols when screening information.
This also involves a pixel, the smallest element of a picture which can be controlled on the screen.
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APA is a process whereby individual cells within the display can be controlled and manipulated.
This way of controlling each bit within an arrangement can be contrasted to systems where the entire display has to be rewritten once a change is necessary.
