**What does the term "knowledge graph" refer to in semantic search?**
A knowledge graph is a network of interconnected entities and their relationships, utilized in semantic search to provide contextually relevant information. It enhances search engines' ability to understand user queries by recognizing the relationships between concepts rather than merely matching keywords. This approach improves the accuracy of search results, leading to a more intuitive user experience and enabling more meaningful interactions with data across various applications, including AI and information retrieval systems.