Does iFrames affect SEO?

Related questions

1. What is example of dynamic?
2. Is IMG self closing?
3. What is IMG Srcset?
4. What is Srcset?
5. What is passport size photo?
6. What is BFC CSS?
7. What is fully responsive?
8. What is progressive rendering?
9. What is normalizing CSS?
10. What is IMG tag?

Tags

1. #iframe
2. #really
3. #content
4. #ranking
5. #coming
6. #receive
7. #recognize
8. #source
9. #counted
10. #credit
11. #search
12. #engines
13. #doesn
14. #robots
15. #referenced
16. #clearly
17. #basically
18. #different
19. #iframes
20. #original
21. #cloaking