Learn in the textbookCloud Service Models (○aaS)
DefinitionSaaS (Software as a Service) is a model in which users rent, over the network, the functions of application software (アプリケーションソフトウェア) running on a provider's servers.
ExplanationThe provider takes care of installing and updating the software and managing the servers it runs on, so users only need to call up its functions from a browser or similar. Many client companies share the same software, and each pays according to how much or how long it uses it.
AnalogyIt is like subscribing to a streaming service instead of buying a shelf of movie discs, and playing whatever you want whenever you want.
Memory hookThe leading S stands for Software. Since the product is the software itself, the only job left for the user is to use it.