A SQL Interface is a connectivity layer that lets tools speak SQL to a database that may use a different native query model. In MongoDB, it refers to a newer SQL-oriented option for BI workflows, designed so reporting tools, dashboards, and analytics platforms can query data through familiar SQL patterns.
From a security perspective, this layer matters because it sits between users and the database and often handles authentication, session setup, query translation, and access control. That makes it a sensitive part of the attack surface: flaws in the interface can expose credentials, mis-handle permissions, or disrupt reporting services. In real environments, defenders should treat it like any other critical middleware, monitor who can use it, and keep legacy connector paths patched or retired when a safer SQL Interface is available.