What is pixel tracking?

Related questions

1. What's a GTM drink?
2. When should I use Google Tag Manager?
3. What is GMT in UTC?
4. Can you use Google Tag Manager without Google Analytics?
5. What are tags?
6. How do I use Google Tag Manager on my website?
7. Where do I put Google Tag Manager script?
8. What is a container in Google Tag Manager?
9. What is a trigger in Tag Manager?
10. How do I find my Google Tag Manager ID?

Tags

1. #advertisers
2. #conversions
3. #website
4. #snippet
5. #visits
6. #analysis
7. #tracking
8. #opens
9. #online
10. #useful
11. #behavior
12. #loaded
13. #email
14. #which
15. #acquire
16. #marketing
17. #pixel