People don’t code in binary, if you mean coding as in making software.
Computers we have nowadays are based on transistors that either let electricity through or don’t. So they can be seen as being on (1) or off (0).
Data can be stored in binary by just agreeing what the data is supposed to represent. E.g. we can say that 00000001 is ‘A’ and 00000010 is ‘B’.
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