Learn in the textbookCloud Deployment Models and Operation Models
DefinitionMulti-cloud (マルチクラウド) is a model that uses services from several cloud providers side by side.
ExplanationProviders differ in their strengths and pricing, so you can pick the service that fits each use and combine them. Besides reducing the risk that one provider's outage stops everything, it helps avoid a state where switching away from a particular provider becomes hard (vendor lock-in). On the other hand, operations take more work because each provider has its own controls and contracts.
AnalogyHaving your salary paid into Bank A while using Bank B for online payments, one account per purpose. If one bank has trouble, not everything stops.
Memory hook"Multi" means many. Just as a multilingual person switches between languages, picture dealing with several providers at once.