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148. what is base64 ?

Base64 is a way to encode binary data in a format that can be easily transmitted over the internet. It is a mechanism for encoding arbitrary binary data into a set of 64 printable characters, which makes it compatible with systems that can't handle binary data. Base64 uses a set of characters to represent binary data as a string of ASCII characters, which consist of letters, digits, and symbols. It is commonly used for sending image, audio, and video files via email or other internet protocols.