What is Apex trigger in Salesforce?

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Tags

1. #trigger
2. #types
3. #custom
4. #after
5. #before
6. #delete
7. #changes
8. #update
9. #insert
10. #records
11. #perform
12. #operations
13. #executes
14. #salesforce
15. #following
16. #enable
17. #triggers
18. #actions