Maybe you can try an analogy with shop owners as servers. Then maybe the following works: Tracking cookie - A visitor card, which will be forcefully checked at

Maybe you can try an analogy with shop owners as servers. Then maybe the following works: Tracking cookie - A visitor card, which will be forcefully checked at other shops, unless you throw it away. Fingerpringting - The shop owner takes your fingerprint from anything you touched in the shop, or even from you paper money or pay card. Tracking pixel - ???