The document discusses bringing multi-tenancy to Apache Zeppelin through the use of Apache Livy. Livy is an open-source REST interface that allows interacting with Spark from anywhere and enables features like multi-user sessions and security. It improves on previous versions of interactive analysis in Zeppelin by allowing custom user sessions through Livy and improving security and isolation between users through mechanisms like SPNEGO and impersonation. The integration of Livy provides multi-tenancy, security, and isolation for interactive analysis in Zeppelin.