Answer:
Double hashing is a technique used in computer science, particularly in the field of hash tables. The purpose of double hashing is to resolve collisions that can occur in hash tables, which are data structures used to store and retrieve data based on a key.
Step-by-step explanation:
In hash tables, collisions occur when two different keys are mapped to the same hash value or index in the table. Double hashing is a method to resolve these collisions by using two hash functions to determine the final index for a key in the table. The first hash function calculates an initial index, and the second hash function calculates an offset, which is added to the initial index to determine the final index for the key. This helps to distribute the keys more evenly in the table and reduces the number of collisions.
Double hashing can be a more efficient alternative to other collision resolution techniques, such as linear probing or chaining, because it minimizes the number of times keys have to be rehashed to find an available index in the table.