Redis is an open source, in-memory data structure store used for building high performance, scalable web applications. It is often referred to as a NoSQL database because it doesn’t use the traditional table-based relational database structure. Redis supports a wide range of data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, and geospatial indexes with radius queries.
Example:
Let’s say you are building an e-commerce website. You need to store product information such as product name, price, description, and reviews. You could use Redis to store this information in a hash structure. You could also use Redis to store the customer’s cart information, including the items they have added to their cart and their total cost. Redis would also be useful for caching frequently accessed data, such as product images or customer profiles.