What is key in react JS?

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  1. #react
  2. #created
  3. #altered
  4. #dynamically
  5. #working
  6. #useful
  7. #lists
  8. #identified
  9. #components
  10. #after
  11. #change
  12. #reactjs
  13. #value
  14. #users
  15. #setting
  16. #uniquely