The main function of a tracking cookie is to monitor and record user interactions on websites. This small piece of data, stored in a user's browser, collects information about browsing habits, such as which pages are visited and for how long. Tracking cookies assist in delivering personalized experiences, targeted advertising, and user analytics to website owners. While they enhance online marketing strategies by providing insights into user preferences, they have raised concerns regarding privacy and data security, leading to stricter regulations on their use.