Are subdomains good for SEO?

Related questions

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2. What is .com or .net called?
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4. Is .com a top level domain?
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6. What are new Gtlds?
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8. How many TLD are there?
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Tags

1. #purposes
2. #considered
3. #organizational
4. #search
5. #pages
6. #website
7. #certain
8. #subdomains
9. #simple
10. #separate
11. #engines
12. #subdomain
13. #entity
14. #indexed
15. #boost
16. #sometimes