The acronym MAC stands for Media Access Control, which is a critical technology in cybersecurity. It refers to a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are essential for creating and enforcing specific security policies, as they are used in filtering network traffic to ensure that only authorized devices can connect to the network. In addition to identifying devices, MAC addresses are instrumental in managing access control lists (ACLs) and monitoring network activity to detect malicious behavior. Overall, MAC is vital for maintaining network security and integrity.