Retargeting & Tracking Pixels: Explained!

How does Facebook know that you doubted to buy something on another website? They use tracking pixels! A small image that is added to other websites & track your activity and interests. Let's Simply Explain how they work.
Tracking pixels are small 1x1 images that are practically invisible, and yet, they can transfer your personal data to advertisement networks like the ones from Facebook, Google and Amazon.
Tracking pixels are sometimes called a "web beacon".
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