The ads you see in most website knows something about you these days. They know what kinds of ads you'll like because they are closely watching the websites you visit the and acts accordingly.
This online marketing which target a user's behavior is called remarketing or retargeting. The very first of these kinds of ads was behavioral targeting. Ads will follow you and will base ads that will show according to the websites you visit.
More details about this ad strategy on the link below.
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