How do I list all the keyspaces in a cluster?

I previously created a keyspace and some tables in a cluster, but forgot what the keyspace name is. How can I see a list of all existing keyspaces in my cluster?

To list all the keyspaces in a cluster from a CQL Shell use:

DESC KEYSPACES

DESCRIBE can also be used. The above works in the same way for ScyllaDB and for Cassandra. You can read more about it in the Docs.