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In cloud computing, a cloud is a collection of servers that cloud customers access over the Internet. Typically, each cloud is managed by a cloud provider – a company that offers cloud services. A public cloud is a cloud that more than one customer shares.
"Multi-cloud" means multiple public clouds. A company that uses a multi-cloud deployment incorporates multiple public clouds from more than one cloud provider. Instead of a business using one vendor for cloud hosting, storage, and the full application stack, in a multi-cloud configuration they use several.
Multi-cloud deployments have a number of uses. A multi-cloud deployment can leverage multiple IaaS (Infrastructure-as-a-Service) vendors, or it could use a different vendor for IaaS, PaaS (Platform-as-a-Service), and SaaS (Software-as-a-Service) services. Multi-cloud can be purely for the purpose of redundancy and system backup, or it can incorporate different cloud vendors for different services.