RADIUS (Remote Authentication Dial-In User Service)

RADIUS (Remote Authentication Dial-In User Service) is a protocol used by networks to securely verify user identities when they try to access network resources, such as Wi-Fi or corporate systems. It serves as an intermediary between the user seeking access and the network's authentication database. When a user attempts to connect, their credentials (like username and password) are sent to the RADIUS server, which checks them and determines whether to grant or deny access. This process helps organizations manage secure access, monitor usage, and enforce policies across their network infrastructure.