Using services from multiple cloud providers to avoid vendor lock-in and optimize performance. Like shopping at different stores to get the best deals and products.
A company uses AWS for compute, Google Cloud for analytics, and Azure for Office 365 integration.
Multi-Cloud is an architecture/strategy (not a single managed service) where an organization uses two or more cloud providers (e.g., AWS, Azure, Google Cloud, OCI) for different workloads or for redundancy.