What is the difference between primary key and foreign key?

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Tags

1. #record
2. #uniquely
3. #identify
4. #default
5. #field
6. #organized
7. #primary
8. #foreign
9. #sequence
10. #difference
11. #clustered
12. #physically
13. #index
14. #another
15. #database
16. #table
17. #between