Multi-cloud means using more than one cloud provider within the same organization. A company might run some services on one provider and other workloads on another, often to improve resilience, reduce vendor dependence, or match different technical needs.
In cyber security, multi-cloud matters because every provider has its own identity model, logging format, permissions system, and configuration tools. That creates more chances for misconfigurations, inconsistent policies, and visibility gaps. Attackers often look for the weakest account, the broadest permission, or the overlooked setting that connects one cloud environment to another. Defenders respond with centralized identity control, continuous configuration monitoring, and clear ownership for each platform. In practice, multi-cloud security is less about the brand of cloud and more about keeping access, policies, and audit data aligned across all of them.