Flexible, in-memory, NoSQL database service supported in many different coding languages.

Redis (Remote Dictionary Server) is an open-source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.Redis supports different kinds of abstract data structures, such as strings, lists, maps, sets, sorted sets, hyperloglogs, bitmaps, streams and spatial indexes.

More info:

https://redis.io/