What is Facebook remarketing pixel?

Related questions

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2. What are pixels in an image?
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5. How many pixels are in 4k?
6. What resolution is 1920x1080?
7. What is pixel example?
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9. Is a 20 megapixel camera good?
10. Is more pixels better?

Tags

1. #serving
2. #website
3. #relevance
4. #creating
5. #facebook
6. #visitors
7. #reach
8. #custom
9. #boost
10. #enhance
11. #audience
12. #versatile
13. #pixel
14. #remarketing
15. #audiences