Topic summary
Recurring revenue

Extracted from the Wikipedia article Revenue stream.
Recurring revenue
Recurring revenue is revenue that is likely to continue to be generated regularly for a significant period of time. It is typically used by companies that sell subscriptions or services. It could take the form of bills paid monthly by consumers, or commercial contracts lasting several years. An example of this is monthly phone contracts. Unless the contract is broken or the customer does not pay, the phone business is guaranteed monthly revenue for the duration of the contract, often 2 years.