Redis (Remote Dictionary Server) is an in-memory, open-source, key-value data store. It is often referred to as a data structure server, as it can store and retrieve high-level data types such as strings, hashes, lists, sets, and sorted sets, with a unique way to handle each one, it also supports advanced data structures like bitmaps, hyperloglogs and geospatial indexes with radius queries.
Redis is known for its performance and scalability, as it can handle extremely high levels of data read and write operations per second, making it a popular choice for use cases such as caching, real-time analytics, leaderboards, and message queues.
It supports a wide variety of data structures and data types, it's also easy to use and has a simple and minimalistic command-line interface and can be easily integrated with other programming languages, it also supports persistence, master-slave replication, and automatic partitioning with Redis Cluster.
Redis is widely used in various application domains such as e-commerce, social media, real-time analytics, and gaming.