Also known as a funnel or drip campaign. It may include the following:

Welcome letter. Usually sent immediately after the prospect signs up for the lead magnet offer or a free trial.

Promotional offer. Often a special price for a limited time.

Last chance. Time is running out on the special offer.

Cart abandonment. When the prospect visits the landing page, but doesn't check out.

Thank you for your order.

Stick letter. A follow up to ensure the offer "sticks." Reduces returns and cancellations.

Onboarding. Inform the customer how to get the most from their purchase.