Remote Access Service (RAS) is a software or hardware solution that allows users to connect to a computer, network, or system from a distant location over the internet or other networks. RAS enables employees, IT administrators, or third-party vendors to access resources, troubleshoot issues, or manage systems without being physically present. Common protocols and technologies used include VPNs, Remote Desktop Protocol (RDP), and SSH. While RAS increases flexibility and productivity, it can also introduce security risks if not properly secured, as attackers often target remote access points to gain unauthorized entry. Best practices include using strong authentication, encryption, and regular monitoring.