Text-to-SQL is a process where natural language queries are transformed into Structured Query Language (SQL) statements. This allows users to interact with databases using everyday language, without needing to know SQL syntax. For instance, asking "What are the sales figures for last year?" could be converted into a SQL query that interacts with the database to retrieve the information. This is related to natural language processing (NLP) and is useful for accessibility and user-friendly data querying.