Explore the versatility and potential of GraphQL as a universal query language in this conference talk from JSConf EU 2019. Delve into a case study demonstrating how GraphQL queries can serve as a unified interface for resolving data across diverse sources, including remote HTTP requests, local CSV files, and in-memory data stores. Discover the possibilities of extending GraphQL's application beyond data fetching, as the speaker investigates its use as an interface for the DOM and various web APIs. Gain insights into how GraphQL's schema language and developer-friendly experience contribute to its growing adoption and potential to revolutionize modern web app development practices.