Remarketing which is also sometimes known as retargeting, is a method of serving targeted ads to people who have already visited or taken action on your website. If we talk in terms of technical execution, remarketing is the process of using a javascript tag (known as a pixel) to place a cookie in the user’s browser. The cookie then informs a remarketing platform to serve specific display ads through an ad exchange, based on the pages or products the user has engaged with or searched for on your website or app. You can get a better insight from the video below.