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What are ASCII, BCD, EBCDIC, Unicode and parity bit?


ASCII:
ASCII is the American Standard Code for Information Interchange. The characters encoded are number 0-9, a-z, A-Z,  basic punctuation symbols, control codes.



BCD:
BCD stands for Binary Coded Decimal. It represent by a 4-bit number  and four bits we can represent sixteen numbers (0000 to 1111). But in BCD code only first ten of these are used (0000 to 1001).

EBCDIC:
EBCDIC stands for Extended Binary-Coded Decimal Interchange Code. It has 8-bit code. It was used by IBM mainframes computers. 

Unicode:

Unicode is a standard for representing the characters of all the languages of the world, including Chinese, Japanese, and Korean. Unicode used 16-bits per character to represent 65,536(216) unique characters. 
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