Website Retargeting is retargeting people who previously visited a website or specific pages.
It matters because most visitors do not convert on the first visit. Retargeting terminology helps teams create thoughtful follow-up sequences, avoid wasted impressions, and respect audience exclusions and privacy expectations.
Example
An audience can include people who visited a particular service page and exclude those who completed its inquiry form. This is more specific than treating every visitor to the website as interested in the same offer.