Retargeting uses technology that collects data and observes behaviour of users that have already visited a business’s website, sending ads to people that might be slipping away, e.g. adds product to cart, then leaves.
Retargeting is a very cost-efficient channel, and directs the media-spend to consumers who have already shown interest in your brand, and have a high chance of converting. This is a “must” to all ecommerce businesses. 

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