ASCII is an acronym for American Standard Code for Information Interchange. The standard presents an almost universally recognized system for coding characters (letters of the alphabet,numerals,symbols,etc.). Data files that contain characters in this coding system are often called ASCII files,although they are also commonly known as “text” files.The coding system uses groups of 8 binary digits to represent the numbers 0 through 255.Each of these numbers stands for a character.For example,number 65 stands for the capital letter A.Thus each ASCII character requires one byte (8 bits) of memory for storage.