Tracking cookies are small text files that websites and advertisers place on your web browser to track your browsing activity across different websites. These cookies collect information such as your browsing history, searches, online purchases, and preferences. The purpose of tracking cookies is to collect data that can be used to serve you with personalized ads and improve the relevance of marketing campaigns. However, tracking cookies can also be used for malicious purposes, such as identity theft and online fraud. It is recommended to regularly clear your cookies to protect your privacy and prevent unauthorized tracking.