Redis Server on Oracle 8.4 is an open-source, in-memory data structure store commonly used as a database, cache, and message broker. It supports various data types such as strings, hashes, lists, sets, and sorted sets. Redis is known for its high performance, flexibility, and ease of use. It offers persistence options, allowing data to be saved to disk or kept in memory. Often used in real-time applications, Redis provides low-latency access to data. It can be deployed in a variety of environments, from small applications to large-scale distributed systems.