What does Upsert mean in Salesforce?

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Tags

1. #upsert
2. #configuring
3. #create
4. #aalbert
5. #specify
6. #checkbox
7. #combination
8. #custom
9. #salesforce
10. #external
11. #field
12. #existing
13. #update
14. #driven
15. #insert
16. #records
17. #setting