The function of a query language in database management is to enable users to communicate with and manipulate data stored in databases. Common query languages, such as SQL (Structured Query Language), allow users to perform operations like retrieving, updating, inserting, and deleting data. By providing a standardized syntax, query languages make it easier to interact with databases, ensuring users can efficiently obtain the information they need. This functionality is foundational for effective data management, analysis, and reporting capabilities.