Retargeting, (aka remarketing), is the strategy of directly advertising to users who have shown interest in a product, application, or other conversion, but who have in some way lapsed from completing the conversion or retaining interest
Retargeting primarily uses advertisements to target audiences who have visited your website or social media profiles. Remarketing leverages targeting people who have already done business with your brand.
Retargeting can give your advertising a significant lift in engagement, which obviously enhances your conversion rates on your ads.
Click-Through Rates (CTR) are also significantly higher for users that get retargeted on display ads.
An average retargeting campaign, performs almost 10X better than a display ad without a retargeting component.