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Alphanumeric refers to a character set with alphabetic characters (A-Z) and numerals (0-9). Other characters also may be included in an alphanumeric character set. Alphanumeric data is useful for storing text and website addresses.
Alphanumeric is also known as alphameric.
A stored alphanumeric character with a six-bit length is smaller than a stored American Standard Code for Information Interchange (ASCII) code character with an eight-bit length.
For increased security, computer users are encouraged to use alphanumeric characters when setting up passwords, usernames and other identifiers. It is more difficult to break an alphanumeric code than a code of all alphabetic characters or all numbers. Special characters and upper and lower-case alphabetic characters are included, in certain cases.