Remarketing (also called retargeting) is the practice of showing ads specifically to people who have already interacted with your business — most often visitors who came to your website and left without taking action. Instead of paying to reach strangers, you are paying to reappear in front of people who already showed some interest.
It works through audience lists. When someone visits your site, a small tag can add them to a list — say, "visited but did not call" or "viewed the water-heater page." Later, as those same people browse other websites, watch YouTube, or search Google, you can show them tailored ads. Google's own documentation frames it plainly: remarketing lets you connect with people who previously interacted with your website or app.
The premise is simple and honest: the first visit rarely closes the deal. Remarketing gives you more than one chance.
