Coreg is short for co-registration. Coreg has become very popular in affiliate marketing. Coreg allows you to populate multiple offers once a visitor fills out a form for the first offer.

For example, your landing page might have an offer for a free bag of M&Ms. The visitor fills out the form to receive the freebie with the fields you have placed on the page such as their name, email address, mailing address and other information.

Before the visitor submits their request, they can check boxes for additional offers listed below the primary offer. Whenever they click those boxes, the information for the additional offers is automatically populated (filled in) from the information they have already provided.