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Difference between Pre-save Validation and Pre-save Expression

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74. What is the difference between Pre-save Validation and Pre-save Expression?

Validation is a process to check and make sure that the data conforms to the business rules of the application. First, pre-save validation will get executed and then expression will execute. In validation, data or input entered will get validated like not dull data, or amount non-zero etc. In expression, it executes a set of operations before saving the record.