Falco is a cloud native runtime security tool designed for Linux operating systems that monitors kernel-level events to detect abnormal behavior and potential security threats in real-time. The tool functions as a kernel monitoring and detection agent that observes system events such as syscalls based on customizable rules. It integrates metadata from container runtimes and Kubernetes environments to provide contextual information about detected events. Falco allows organizations to analyze collected security events by forwarding them to SIEM systems or data lake platforms for further investigation and correlation. The tool operates at the kernel level to provide deep visibility into system activities and runtime behavior. Originally developed by Sysdig, Falco has become a graduated project under the Cloud Native Computing Foundation (CNCF) and is deployed in production environments across various organizations for runtime security monitoring.