According to wikipedia, «in computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data. It uses routines, often called validation rules or check routines, that check for correctness, meaningfulness, and security of data that are input to the system. The rules may be implemented through the automated facilities of a data dictionary, or by the inclusion of explicit application program validation logic ».
In other words, the data are checked against a data model. The data model could be simple or elaborated : it is up to the human validator to define to which extent the data have to be validated.
Often data validation is understood as validating numbers, dates and text, i.e. verifying types and ranges. For that purpose, spreadsheet dedicated function can do the job. However in a number of applications the data model could be quite complex and verification difficult to automate, hence leaving room for human errors during validation.
For digital photographers, “data validation generally addresses three questions. Is the archive complete? Did the files transfer properly? And, are the files uncorrupted?“. This interpretation is out of the scope of this article.
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