Keet was riding the bus and saw a man wearing a new pair of shoes from his favorite brand. He liked them but thought they'd look better in black. When he got home, he went online and found
them in black at an online store, Zaps. They were pretty expensive, so he decided to post a picture
of them on his social media account to see what his friends would think. The next day, he started
seeing ads for the exact shoes and for the online store he had visited. He saw the ads appear
when he typed in a search, when he went to his favorite news site, and when he was scrolling
through his social media feed. At first he thought it might've just been a coincidence, but when it
kept happening, he started to wonder, why am I seeing this everywhere?
. How did the advertising company know he was interested in those shoes? Or in that store?