Security Service Edge (SSE) is a type of security solution that is designed to protect the edge of a network, which is the point where the network connects to the Internet or to other networks. SSE solutions are typically deployed as part of a network security strategy, and are used to protect against external threats, such as malware, hacking attempts, and unauthorized access. 

SSE solutions typically involve the use of technologies and techniques, such as firewalls, intrusion prevention systems, and access controls, to protect against external threats and to control access to the network. They may also involve the use of security protocols, such as VPNs, to secure communication between the network and external devices. 

SSE solutions are an important part of a comprehensive security strategy, as they can help to protect against external threats and to ensure the security of the network. They can be deployed as hardware appliances, software solutions, or cloud-based services, and can be used to protect networks of all sizes, from small business networks to large enterprise networks.