VRAM 【Video DRAM】
full spelling ： Video Random Access Memory
VRAM is a type of memory formerly used in graphics adapters. It is a dual-ported version of DRAM. VRAM is Dual-ported, meaning that it can be accessed by two devices simultaneously. This allows the monitor to access the memory for screen updates, while at the same time allowing the graphics processor to provide new data.
VRAM is a buffer between the computer processor and the display. When computer displaying, the image is first read by the processor and then written to the VRAM. The data is then converted by a RAM digital-to-analog converter (RAMDAC) into analog signals that are sent to the display.
VRAM is rapidly superseded by technologies like SGRAM and DDR-SDRAM.