ASCII (American acronym for American Standard Code for Information Interchange - American Standard Code for the Exchange of Information-), generally pronounced [áski] 1: 6 or (rarely) [ásθi], is a character code based in the Latin alphabet, as it is used in modern English. It was created in 1963 by the American Standards Committee (ASA, known since 1969 as the National Institute of National Standards, or ANSI) as a recasting or evolution of the code sets then used in telegraphy. Later, in 1967, lowercase letters were included, and some control codes were redefined to form the code known as US-ASCII.
ASCII defines 128 characters, which are assigned to the numbers 0-127. Unicode defines (less than) 221 characters, which, similarly, are assigned to numbers 0-221 (although not all numbers are currently assigned, and some are reserved).
Unicode is a superset of ASCII, and numbers 0-128 have the same meaning in ASCII as in Unicode. For example, the number 65 means "Latin capital 'A'".
Because Unicode characters generally do not fit into an 8-bit byte, there are numerous ways to store Unicode characters in byte sequences, such as UTF-32 and UTF-8.