Z-Buffer, in a graphics card, is a section of video memory that keeps track of which onscreen elements can be viewed and which are hidden behind other objects. You can think of it as a buffer that stores the depth information for displaying three dimensional graphics. Two dimensional images may be displayed using X, Y coordinates but the third dimension implies X, Y, and Z. In a graphics card, Z-Buffer memory keeps track of which onscreen elements are visible and which ones are hidden behind other objects. In the end, the Z-Buffer will allow the graphics card to correctly reproduce the usual depth perception.
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