A knowledge graph enhances search results by connecting related information and entities in a structured manner. It uses a network of relationships to represent data semantically, allowing search engines to understand the context and meaning behind queries, rather than just keyword matching. For instance, if a user searches for a specific person, the knowledge graph can present relevant facts about their relationships, achievements, and related topics. This enriched search experience provides users with more comprehensive answers and insights, improving the overall quality of search results.