Video random-access memory
VRAM[1][2] is a common abbreviation for Video Random Access Memory, which is the dedicated memory a GPU store and access the pixels and other graphics data rendered on a computer monitor. This is often different technology than other computer memory, to facilitate being read rapidly to draw the image. In some systems this memory cannot be read/written using the same methods as normal memory; it is not memory mapped.
The term "VRAM" sometimes means a specific technology used in the 1980s to implement it, dual-ported DRAM.