The Difference Between Unicode and UTF-8

Unicode is a character set. UTF-8 is encoding.
Unicode is a list of characters with unique decimal numbers (code points). A = 65, B = 66, C = 67, ....
This list of decimal numbers represent the string "hello": 104 101 108 108 111
Encoding is how these numbers are translated into binary numbers to be stored in a computer:
UTF-8 encoding will store"hello" like this (binary): 01101000 01100101 01101100 01101100  01101111
Encoding translates numbers into binary. Character sets translates characters to numbers.

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