Vanna is an open-source framework for building natural-language interfaces to databases, especially text-to-SQL applications. It connects language models with database schemas, documentation, examples, and query execution so users can ask business questions in ordinary language and receive generated SQL and data-backed answers.

The framework is designed around retrieval-augmented generation for SQL: relevant schema information, documentation, and prior examples can be supplied to the model before it writes a query. Developers can connect different LLMs, vector stores, databases, and application interfaces, then add controls around query execution and result presentation.

Vanna is useful for analytics assistants, internal data tools, and embedded products where users need database access without writing SQL manually. Its modular architecture lets teams keep their existing data warehouse and model choices while adding a conversational layer on top.