framebuffer

thumb|Sun TGX Framebuffer thumb|320x320px|Sets 1, 2 and 3 represent the operation of single, double and triple frame-buffering, respectively, with Screen tearing#Vertical synchronization|vertical synchronization (vsync) enabled. In each graph, time flows from left to right. For details, see the page on [[multiple buffering.]] A framebuffer (frame buffer, or sometimes framestore) is a portion of random-access memory (RAM) containing a bitmap that drives a video display. It is a memory buffer containing data representing all the pixels in a complete video frame. Modern video cards contain framebuffer circuitry in their cores. This circuitry converts an in-memory bitmap into a video signal that can be displayed on a computer monitor.

In computing, a screen buffer is a part of computer memory used by a computer application for the representation of the content to be shown on the computer display. The screen buffer may also be called the video buffer, the regeneration buffer, or regen buffer for short. The phrase "screen buffer” refers to a logical function, while “video memory” refers to a hardware storage location. In particular, the screen buffer may be placed in the main RAM, the video memory, or some other hardware location.