Azure Sentinel is a cloud-native security information and event management (SIEM) and security orchestration, automation and response (SOAR) solution that uses built-in machine learning to detect threats and allows security teams to automate responses. It collects security data from across an organization, including Microsoft 365 data for free. Azure Sentinel is scalable and has no infrastructure costs, with customers only paying for resources used. It integrates with existing security tools and data sources.