The document discusses Google's vision for the perfect search engine. It should understand user intent from natural language queries, have knowledge about the world, and return exactly the right results to answer questions or help make decisions. Google is working to map the universe of things, not just web pages, through projects like the Knowledge Graph. This will allow search to understand queries about topics rather than just text matches, and provide relevant summaries and explorations of those topics. The goal is for search to be truly universal and able to answer increasingly complex questions across all information.