Secure Sockets Layer (SSL) Virtual Private Network (VPN) is a type of VPN that uses SSL to encrypt the data transmitted between the VPN client and the VPN server. SSL is a security protocol that is used to establish an encrypted link between a web server and a client, such as a web browser. 

An SSL VPN allows users to connect to a VPN remotely, over the Internet, and access the resources of the VPN as if they were connected directly to the network. It provides a secure connection for remote access to the network, and can be used to protect against external threats, such as hackers and malware. 

SSL VPNs are commonly used by organizations to provide remote access to their networks and resources to employees, contractors, and other authorized users. They can be used to access a variety of resources, such as email, file servers, and applications, and are often used in conjunction with other security measures, such as firewalls and intrusion prevention systems.