Calibration and validation are often confused, and their terms are also used interchangeably, However, calibration and validation are two different processes and are made for various purposes.
This video discusses some reasons why calibration and validation are confused with each other and in the last also discusses some key differences between them
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https://pharmaspecs.com/calibration-and-validation/
Difference between calibration and validation
Calibration and validation
Calibration and validation difference
Calibration and validation in pharmaceuticals