This document discusses multi-cloud security architecture. It outlines some of the key challenges of securing applications and data across multiple cloud platforms, including secrets management, identity and access management, application security, and data security. It also presents some common cloud security frameworks like FedRAMP and tools like CASB, CWPP, and CSPM that can help address these challenges. Finally, it notes that with organizations increasingly using both private and public clouds, multi-cloud environments are inevitable, and security needs to span all cloud domains including governance, risk, compliance and more.