A funnel is a series of web pages, forms and email auto responses which potential customers move through based on their interest in your products or services.

The first stage of your funnel offers something of value, for free, to you’re a potential customer in exchange for their email address.

The second stage thanks them and offers an upgrade to the free item for a deeply discounted price.

The third stage thanks them for their purchase and offers your core product/service.

This funnel moves a cold lead into a customer, but more than that, it captures the email address of everyone and drops them in an autoresponder sequence that reminds them of their initial interest in your product or service and leads them back to the next offer.