Win-Back Campaign is a campaign aimed at encouraging past customers or inactive contacts to return.
It matters because email is one of the few channels a business can own directly. Strong email fundamentals improve trust, deliverability, segmentation, and long-term lead nurturing.
Example
A retailer contacts eligible past purchasers who have not returned within a typical reorder period. A useful product update or replenishment reminder gives them a reason to return without assuming every lapsed customer needs a discount.