Facebook retargeting (AKA Facebook remarketing) is a form of marketing that involves using Facebook ads to re-target people who are already somewhat engaged with your brand. You do this by placing cookies on their computers and that way tracking the things that theyre interested in. For example, if someone spends a little bit of time on the checkout page of your website, with a specific product (or category of product) in their shopping cart, you can then subsequently show them that same product or a similar one. This significantly increase their likelihood of buying. But even if they dont buy, it can still have numerous benefits for your strategy in the long term.