A Network Access Server (NAS) is a device that enables remote users to connect to a network. It acts as a gateway, allowing secure access to resources such as files, applications, and services over the internet. NAS devices often support various protocols, including PPP (Point-to-Point Protocol) and RADIUS (Remote Authentication Dial-In User Service), to manage user authentication and authorization. In addition to providing access, a NAS can also facilitate network management by monitoring user activity and ensuring security. It is commonly used in organizations to support remote work and secure connections for employees, enhancing productivity while maintaining data integrity.