Retargeting is a form of online advertising that allows businesses to serve ads to users who have previously visited their website. It is a way to reconnect with visitors who may not have made a purchase or taken a desired action on the website.

Retargeting works by placing a small, unobtrusive code on the company's website. This code, known as a 'retargeting pixel', places an anonymous cookie in the user's browser, which is then added to a list. When the user visits other websites that are part of the retargeting company's network, they are shown ads from the company that placed the retargeting pixel on their website.

Retargeting can be an effective way to bring visitors back to a website and encourage them to complete a purchase or perform a desired action. It can also be a useful tool for businesses to stay top of mind with their audience and showcase products or services that the user may be interested in.