What are trackers on the Internet?

Related questions

1. Can I be tracked if I use a VPN?
2. Are private trackers safe?
3. What are public trackers?
4. Can you tell if your phone is being tracked?
5. How do I add trackers to uTorrent?
6. Why is my download speed so slow when I have fast internet?
7. Can police see what you search on the Internet?
8. Why are my Google searches showing up on Facebook?
9. Does Facebook track my Google searches?
10. Can I download and upload at the same time?

Tags

1. #other
2. #tracker
3. #practice
4. #which
5. #third
6. #tracks
7. #assists
8. #visit
9. #party
10. #tracking
11. #visited
12. #entity
13. #website
14. #directly
15. #refers