Redis

Redis Hashes are maps between the string fields and the string values.

Redis Sorted Sets are, similarly to Redis Sets, non repeating collections of Strings. The difference is that every member of a Sorted Set is associated with a score

A message queue is a queue of messages sent between applications. It includes a sequence of work objects that are waiting to be processed.

Redis internally uses a hash table to store the elements as a Set.

The Redis database internally stores List as a linked list. This linked list has a `head` and `tail`

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker