Subscriptions.

What used to be saved for magazines and book clubs has quickly become a model for products and services. Why?

Subscriptions can be automated and renewed on a regular basis, making purchases and memberships easy.

Subscriptions come in a variety of forms:

Temporary subscriptions: One-time events that don’t require follow-up. For example, a concert, sporting event, or show. You can opt-in to receive updates on future events.Limited subscriptions: AKA trial subscriptions or offers. ...