Revenue Streams should be the result of successful value propositions offered to customer segments. It is a way of categorizing the earnings of a company. A business model can involve two different types of Revenue Streams: Transaction Revenues (one-time payments), and Recurring Revenues (i.e.: post-purchase support, etc.). Revenue Streams Generators are: Asset sale (ownership sale), Usage fee, Subscription fees, Lending/Renting/Leasing, Licensing, Brokerage fees, and Advertising
So Revenue Streams are all the ways that you can earn money. If a customer buys your product it's a Transaction Revenue, but if they sign up for a subscription it’s a Recurring Revenue. The Revenue streams must be able to pay for all of the costs in your business: rent, production, wages, insurance and profit.
