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Definition of Blue screen
1. Noun. (film) The filmmaking technique of shooting foreground action against an evenly-lit monochromatic background for the purpose of removing the background from the scene and replacing it with a different image or scene. ¹
2. Noun. (film) The visual effect resulting from this technique as well as the colored screen itself, especially blue. ¹
3. Noun. (computing) An (error screen) displayed by some (operating systems), most notably (Microsoft Windows), after encountering a critical (system error) which can cause the system to shut down, to prevent damage to (system hardware). ¹
¹ Source: wiktionary.com