What is checkin and checkout in version control?

Related questions

1. What is SVN checkout TortoiseSVN?
2. What is meant by SVN repository?
3. What is the difference between GIT and SVN?
4. What is meant by SVN checkout?
5. What does SVN checkout do?
6. What is code checkout?
7. What is the use of SVN checkout?
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Tags

1. #checks
2. #modifications
3. #checked
4. #person
5. #inback
6. #those
7. #management
8. #version
9. #checkout
10. #people
11. #checkin
12. #control
13. #widely
14. #document
15. #methodology