Data is represented in bytes, which are a set of 8 bits which are either 0 or 1. So all data is in groups of 0's and 1's which each represent something, like a character. For example, all Capital letters are 010----- for example 'V' is 01010110 and all lowercase letters are 011----- for example 'v' is 01110110. If you know how to count in binary, you will notice that v is the 22nd letter and 10110 is 2+4+16=22.
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