What is a hash map in programming and where can it be used

Question

I have often heard people talking about hashing and hash maps and hash tables. I wanted to know what they are and where you can best use them for.

Answer 1

Hashmap is used for storing data in key value pairs. We can use a hashmap for storing objects in a application and use it further in the same application for storing, updating, deleting values. Hashmap key and values are stored in a bucket to a specific entry, this entry location is determined using Hashcode function. This hashcode function determines the hash where the value is stored. The detailed explanantion of how hashmap works is described in this video: https://youtu.be/iqYC1odZSNo