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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

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.