What is the difference between update to head and update to version in SVN?

Related questions

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5. What does SVN revert do?
6. What is SVN head?
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Tags

1. #something
2. #revision
3. #status
4. #words
5. #difference
6. #update
7. #repository
8. #other
9. #synchronize
10. #similar
11. #following
12. #working