Anti-aliasing smooths the jagged edges you see on diagonal lines, curves, and text in graphics, making images look cleaner and more natural. In games, it often improves visual quality at the cost of some performance.

What it does

  • Reduces the “stair-step” look on edges.
  • Makes objects, fonts, and outlines look less blocky.
  • Helps 3D scenes and images appear more realistic.

In simple terms

Think of a circle made from square pixels: without anti-aliasing, the edge looks rough. Anti-aliasing blends edge pixels so the shape looks smoother to your eye.

Trade-off

  • Higher quality image.
  • Possible FPS/performance cost, depending on the method used.
  • Some methods are sharper; others are blurrier but faster.

TL;DR: anti-aliasing makes graphics look smoother by hiding pixel jaggies, especially along curves and diagonal lines.