A hash function maps an object to a unique number.

Name: A hash function maps an object to a unique number.
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Quizplus · Accepted Answer

A hash function does not necessarily map an object to a unique number. In fact, multiple objects can map to the same hash value, which is known as a hash collision. However, a good hash function will minimize the number of collisions and maximize the number of unique hash values.

A Hash Function Maps an Object to a Unique Number