Cross-site tracking refers to the activity of tracking across multiple websites. Websites that have enabled third-party trackers can share the information they collect about their users with third parties.
To understand how it works, let’s take social media widgets as an example.
Websites owners add social media widgets to increase the shareability of their content and get useful analytics. However, at the same time, they send back information to platforms such as Facebook, Twitter, or LinkedIn. That’s because social media widgets act like pixel tags, short snippets of code embedded within tiny images.