This episode introduces GraphRAG, a novel retrieval-augmented generation approach that utilizes knowledge graphs to enhance question answering over large text collections. This method constructs a graph of entities and their relationships, subsequently identifying thematic communities and generating hierarchical summaries. GraphRAG aims to overcome the limitations of traditional RAG methods when addressing broad, global queries that require understanding the entire corpus rather than just retrieving isolated information. Evaluations demonstrate that GraphRAG significantly improves the comprehensiveness and diversity of generated answers compared to conventional RAG techniques, particularly for sensemaking tasks, while also offering scalability advantages over direct text summarization. The paper also proposes an adaptive benchmarking method for evaluating such global understanding capabilities