A tracking cookie is a cookie that tracks your browsing behaviors. Marketers use this data to understand how users use their partner websites and optimize their networks for the average user that visits their networks

HTTP cookies r parcels of text sent by a server to a web client & then sent back each time it accesses that srvr. Used for authenticating, session tracking, & maintaining info re users, like site prefs or e-shopping cart contents.

Privacy probs - can be used 4 tracking browsing behavior. Been criticized because user id's they provide isn't always accurate & they could potentially be a target of network attackers. Alternatives exist, each with its own uses, pros&cons