Security as a Service is a way to deliver security technologies, traditionally deployed as hardware appliances in enterprise data centers or regional gateways, as a cloud service. Security as a service has become an important enabler of business in the increasingly cloud and mobile world because it is everywhere, providing secure access to applications and services no matter where they are hosted or where users connect. Security as a service closes gaps in enterprise security created by off-net users and those connecting directly to cloud apps and the open internet rather than being routed through the secure gateway.