+A **hash** is a fixed-size value, often a string of numbers and letters, generated by a [hash function](/wiki/hash-function) from input data. It acts as a unique digital fingerprint, used for efficient [data lookup](/wiki/data-lookup) in tables and to verify data integrity.
+## See also
+- [Algorithm](/wiki/algorithm)
+- [Checksum](/wiki/checksum)
+- [Cryptography](/wiki/cryptography)
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