Redis is not a database. It’s a key / value store.
It kind of is a database:
A key-value database, or key-value store, is a data storage paradigm designed for storing, retrieving, and managing associative arrays, a data structure more commonly known today as a dictionary.
https://en.wikipedia.org/wiki/Key–value_database
that's still a database.
it's not a relational database.
you are confusing redis with memcached
It kind of is a database:
A key-value database, or key-value store, is a data storage paradigm designed for storing, retrieving, and managing associative arrays, a data structure more commonly known today as a dictionary.
https://en.wikipedia.org/wiki/Key–value_database