Base64: make anything to a "simple" text and reverse.
Where "simple" means that contains only the 'A'–'Z', 'a'–'z', '0'–'9', '+', '/' and '=' characters.
It's not in any way something to use for encryptions its just for converting raw data to text.
It's most used when the data contain small bytes (control characters) which are trick to send handle in some environments.
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