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What's the exact difference between Unicode and ASCII?
ASCII has a total of 128 characters (256 in the extended set).
Is there any size specification for Unicode characters?
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Unicode uses between 8 and 32 bits per character, so it can represent characters from languages from all around the world. It is commonly used across the internet. As it is larger than ASCII, it might take up more storage space when saving documents.
The difference between ASCII and Unicode is that ASCII represents lowercase letters (a-z), uppercase letters (A-Z), digits (0-9) and symbols such as punctuation marks while Unicode represents letters of English, Arabic, Greek etc.
UTF-8 encodes Unicode characters into a sequence of 8-bit bytes. The standard has a capacity for over a million distinct codepoints and is a superset of all characters in widespread use today. By comparison, ASCII (American Standard Code for Information Interchange) includes 128 character codes.
Unicode is the universal character encoding used to process, store, and exchange text data in any language, while ASCII is used to represent text such as symbols, letters, numerals, and so on.
ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 221 characters, which, similarly, map to numbers 0–221 (though not all numbers are currently assigned, and some are reserved).
Unicode is a superset of ASCII, and the numbers 0–127 have the same meaning in ASCII as they have in Unicode. For example, the number 65 means "Latin capital 'A'".
Because Unicode characters don't generally fit into one 8-bit byte, there are numerous ways of storing Unicode characters in byte sequences, such as UTF-32 and UTF-8.
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