OASIS CACAO (Collaborative Automated Course of Action Operations) is an open standard developed by OASIS for encoding cybersecurity response procedures into machine-readable, executable playbooks. CACAO enables organizations to automate, share, and orchestrate incident response actions across different security tools and platforms. By using a standardized format, CACAO playbooks help teams respond quickly and consistently to threats, reduce manual effort, and improve collaboration both within and between organizations. The standard supports integration with various cybersecurity frameworks and can be used to document, exchange, and automate courses of action for threat mitigation, investigation, and recovery.