Answer: Databricks web application

In the classic Databricks architecture, the control plane manages the cluster and orchestrates tasks but doesn't directly host the worker nodes, JDBC data sources, Databricks Filesystem (DBFS), or driver nodes. The Databricks web application, on the other hand, is hosted entirely within the control plane, providing a user interface for cluster management, job execution, and other administrative tasks.

Author: Keng Suppaseth