An IT service provider that specializes in cybersecurity. An MSSP’s offerings might include intrusion detection and management, firewalls, virus and spam blocking, VPN management, vulnerability assessment, and threat intelligence, as well as system modifications and upgrades. Given an increasingly complex threat landscape, MSSPs are more in-demand than ever, especially in regulated industries such as health care and financial services. For many businesses, outsourcing some or all of their IT security functions to an MSSP presents a way to cut costs, eliminating the need to hire full-time security experts and reducing capital expenditures on equipment and software.