Buffer Overflow Intro. ©2002, Jedidiah R. Crandall, Susan L. Gerhart, Jan G. Hogle.  http://sfsecurity.pr.erau.edu
Characters are represented as numbers, too
The easiest way to store something like a name is to assign each number from 0 to 255 with a character. 
For example: “A” = 65, “D” = 68, “d” = 100. 

One such assignment is the (Technie nomenclature) ASCII character set which is a national standard.