The present page serves as an overview for the topic. All available documents for the topic can be found here.
Generally, a subscription is a one-time triggered, but periodically executed purchase of certain products or services. In subscription-based business models, consequently, customers pay periodically to use or receive a defined set of products or services at a regular base.
In the context of the Intershop Cloud Portal, a subscription is a billing container for deployed Microsoft Azure services.