What is ASCII?
ASCII (American Standard Code for Information Interchange) defines 128 characters. The ASCII characters map to the numbers 0–127.
What is Unicode?
Unicode defines 2^21 characters. The Unicode characters map to the numbers 0–2^21. Not all numbers are currently assigned with Unicode character. Some of the numbers are reserved.
|Defines 2^7 characters (Extended has 2^8)||Defines 2^21 characters|
|Numbers 0–127 of ASCII has the same meaning similar to Unicode||Numbers 0–127 of Unicode has the same meaning similar to ASCII|