Redis (REmote DIctionary Server) is an open-code project similar to Memcached that enables you to store data. The tool is used to speed up website loading by caching data and objects in RAM. Thus it reduces the number of times an external data source such as a database or API must be read.
Redis uses the NoSQL model key-value for data storage and management just like Memcached. The information is stored in integrated in-memory NoSQL databases. Redis also allows data persistence, as it copies/saves information on the disk.