Defog.ai is a natural language data query tool that is embedded in applications. The tool allows users to ask free-form data questions and access data from CSV files or predefined datasets. Data can be queried from databases such as Redshift and ticket sales, with examples such as a sample dataset called Tickit. The tool enables users to ask questions in any language and provides answers to long-tail questions. Unlike other solutions, Defog allows data superpowers without compromising on privacy, as it only needs access to the database schema, not the actual data. The tool is backed by Y Combinator and has a demo available, allowing users to embed data superpowers in their app.