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Hash Tables
In computing, a hash table (hash map) is a data structure that implements an associative array abstract data type, a structure that can map keys to values. A hash table uses a hash function to compute an index, also called a hash code, into an array of buckets or slots, from which the desired value can be found.
PowerPoint Presentation
Hashing Simulations - Try it yourself
https://opendsa-server.cs.vt.edu/ODSA/AV/Development/hashAV.html
https://visualgo.net/en/hashtable
https://www.tutorialspoint.com/data_structures_algorithms/hash_data_structure.htm