ASCII, on its own, only has 128 values (7 bits). This only takes care of 0-9, A-Z, a-z and punctuation. Languages that have characters outside of the English language cannot be used.
UNICODE, on the other hand, has more than 100,000 characters--a universal character set. Because of this, it's used more commonly now that ASCII, so that anyone in any country can read it.
Please keep in mind the length requirement for your posts.
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