Encoding
An encoding is a mapping of a character to a sequence of bits. All encodings except Unicode are called multibyte encodings.
Charset
A charset is the application of an encoding for each character in a character set. In other words, it is a character set in which every character has been assigned an encoding unique numeric value.
Code page
A code page is a unique physical implementation of a charset. A code page is usually identified by an unsigned integer, although some MLang APIs require a DWORD as a code page identifier value instead.
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