<ul data-eligibleForWebStory="false">Neural graph databases (NGDBs) are efficient data retrieval mechanisms for deep learning-based models to access precise information.Current NGDBs are limited to single-graph operation, hindering reasoning across multiple distributed graphs.The lack of support for multi-source graph data in existing NGDBs affects reasoning across distributed sources, impacting decision-making.Proposed solution, Federated Neural Graph DataBase (FedNGDB), uses federated learning for privacy-preserving reasoning over multi-source graph data, improving data quality.