A subscription is a business model by which a customer agrees to pay the website for a member area access throughout a specified time-period.
For example, the customer may agree to purchase a one-year subscription to brazzers.com which he can access at any time for 365 days.
The customer may pay the entire sum upfront, or he will pay on a monthly basis. The payment is usually applied automatically, and therefore the customer will need a credit or debit card and agree to be charged.