Recurring billing means the client will be billed automatically on every term completion, for example, a monthly term would mean the client gets billed automatically every month the same as before.
Recurring Billing Service lets your business get paid automatically on a regular basis. Here is the clickbank FAQ url. Thanks.
in simple english, it means a monthly subscription fee. it could be for constant access to your site, newsletters, etc.
recurrent billing take you money without you knowing if it is submitted to paypal better be alert on filling those forms on the quick rich schemes on internet..