Azure Sentinel is a cloud-native security information and event management (SIEM) tool that uses built-in artificial intelligence and vast threat intelligence to detect threats across organizations. It collects security data from various sources at scale in the cloud with no infrastructure costs or limits. Azure Sentinel reduces alert fatigue by up to 90% through correlated rules and user entity behavior analysis integrated with Microsoft 365. It also allows security teams to investigate threats and hunt for suspicious activities assisted by AI.