Computer screens present graphics (and text created as a graphic) using a rigid, straightline arrangement of pixels (dots on the screen). Sometimes this results in a jagged, stair-step effect along the edges of pictures or graphic text characters.
Anti-aliasing is a clever method smoothing the transition from one color to another by using dots with in-between colors. Anti-aliasing is important for site usability because it typically results in pictures and graphic text that are easier to read.
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