CSMA/CD (copyright Sense Multiple Access with Collision Detection) is used in wired networks like Ethernet to detect and handle collisions after they occur. CSMA/CA (copyright Sense Multiple Access with Collision Avoidance) is used in wireless networks to avoid collisions before they happen using techniques like acknowledgments and backoff timers. https://www.uninets.com/blog/csma-ca-vs-csma-cd-difference