A hash is a data structure that maps keys to values.

A hash table is an efficient data structure for storing and retrieving data.

Hash works by transforming the key using a hash function into a hash, which is then used to index an array

Hash tables can be implemented using a variety of data structures, including arrays, linked lists, and binary trees.

One disadvantage of hash tables is that they can suffer from collisions, which occur when two different keys are mapped to the same hash

There are various strategies for handling collisions, including separate chaining and open addressing.

Hash functions transform keys into hashes using a mathematical operation and the size of the array.