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Standard-definition television (SDTV) is a television system that has a resolution that meets standards but not considered either enhanced-definition television (EDTV) or high-definition television (HDTV).

The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as analog systems. Examples of Standard Definition video modes are 480i, 480p, 576i and 576p.

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