“Secure Access Service Edge is a term coined by Gartner in 2019, defined as the convergence of multiple network and security-as-a-service capabilities, such as software-defined wide-area networks, secure web gateways, CASB, next-generation firewalls and zero-trust network access. SASE is delivered as a service and enables zero-trust access based on the identity of the device or entity, combined with real-time context and security and compliance policies.”
https://siliconangle.com/2021/08/21/big-three-innovations-transforming-cloud-security/