Re-Engagement Campaign is a campaign designed to win back inactive subscribers, leads, or customers.
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
An email program identifies subscribers with a long period of inactivity and sends a preference-check message. It assesses clicks or other reliable activity as well as opens, then suppresses contacts who remain unresponsive under its policy.