Magic Number is a constant numerical or text value used to identify a file format or protocol. Detecting constants in files is a simple way of distinguishing between file formats, basically every file has an header and a footer in order to get correctly recognized, for example a pdf file starts with “%PDF” and ends with “%EOF” while a jpeg image file begins with “0xFFD8” and ends with “0xFFD9”. These constants are called magic numbers.
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