+**Standard Definition** (SD) is a video [resolution](/wiki/resolution) format, a common visual standard for older [television](/wiki/television) broadcasts and video recordings. It delivers images with fewer pixels than modern formats, often seen as a softer, less detailed picture, preceding the clarity of High Definition.
+## See also
+- [High Definition](/wiki/high_definition)
+- [Resolution](/wiki/resolution)
+- [Aspect Ratio](/wiki/aspect_ratio)
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