Post
Smoothing out the staircase-like jagged edges that appear where diagonal lines meet the pixel grid.
Pixels are square, but the world is not. When a diagonal line or curved edge is rendered on a grid of square pixels, you get jagged staircase patterns called 'aliasing' or 'jaggies.' Anti-aliasing techniques fight this in various ways. MSAA samples multiple points per pixel at edges. FXAA blurs edges in post-processing, which is fast but can soften the image. TAA uses data from previous frames to smooth edges over time, which is effective but can cause ghosting on moving objects. DLSS and FSR use machine learning or spatial upscaling to reconstruct clean edges from lower-resolution renders.
Example
Red Dead Redemption 2 uses TAA heavily, which gives it a smooth but sometimes slightly soft look. Many PC players disable TAA in Elden Ring because the ghosting artifacts on moving foliage are distracting. NVIDIA's DLSS in games like Alan Wake 2 represents the cutting edge, delivering anti-aliased images at higher performance than native resolution.
Why it matters
Anti-aliasing is one of the first things your eye notices when it is missing. Jagged edges make even beautiful games look rough and unfinished. The ongoing evolution from brute-force MSAA to AI-driven solutions like DLSS shows how the industry constantly finds smarter ways to solve the same fundamental problem.
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