Hashing : It is an address calculation technique. Hashing is a method of directly computing the index of the table by using a suitable mathematical function called a hash function.
Hashing tries to compute the address where an element is to be
inserted or found in a table by applying a hash function to a
given key value.
It is also known as hash table method,direct addressing
technique,key-to-address transformation method,randomizing
technique and scatter storage technique.