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Typically a graphical style where there are one two colors. (A bit can be either on or off, so two options) Commonly black and white, but can be any combination depending on the style the creator is trying to accomplish. 

An 8-bit handheld game console developed and manufactured by Nintendo. Now popular among home-brew creators and modern developers looking to capture a retro style

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

Programs that typically run in the graphics pipeline directly on the GPU to apply special effects to graphics