Caching is a technique to store and reuse the results of expensive operations to improve performance and reduce the load on underlying systems. It involves saving the results of an operation in a temporary storage location, called a cache, and then retrieving the results from the cache instead of performing the operation again when the same input is provided.
Redis is an open-source, in-memory data structure store that can be used as a database, cache, and message broker. It is highly performant and supports a wide range of data structures such as strings, hashes, lists, sets, and more.