Microsoft

Azure Network Watcher Flow Logs capture information about IP traffic flowing through Azure Network Security Groups (NSGs) and Virtual Networks. They record details about each network flow including source and destination IP addresses, ports, protocol, traffic direction, and whether the flow was allowed or denied by security rules. 

Flow logs are essential for network security monitoring in Azure, enabling detection of lateral movement, data exfiltration, port scanning, and unauthorized network access. They support network troubleshooting, traffic analysis, and compliance requirements, providing the network-level visibility needed to understand communication patterns and identify anomalous traffic within Azure environments.