What is Redis?
Redis is an in-memory data structure store, used as a distributed, in-memory key-value database, cache and message broker, with optional durability.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is Redis?
### Input: 
### Response: Redis is an in-memory data structure store, used as a distributed, in-memory key-value database, cache and message broker, with optional durability.