In cybersecurity, a carrier refers to a telecommunications company that provides wireless network services, such as voice, messaging, and data connectivity, to mobile devices. Carriers act as intermediaries between users and the internet, enabling mobile communications and data transfer. They play a crucial role in network security, as they manage infrastructure, enforce security policies, and may detect or mitigate threats like spam, malware, or unauthorized access. Carriers must protect their networks and customers from cyberattacks, data breaches, and privacy risks. Understanding the role of carriers helps organizations and individuals better secure their mobile communications and data.