Validation is about making sure that the data entered is sensible and possible and within reasonable bounds.

Just becasue the data is reasonable and possible does NOT mean that it is CORRECT.

Validation is about making sure that the data entered is within reasonable bounds and sensible
– NOT correct.

Invalid data will contain an error, however just because data is valid, does not mean it is sensible.  Check this link out to see how valid data can in fact be nothing better than nonsense.

Validation can be performed at almost any stage of the data processing cycle, from data collection to final output of information.

 There are many different validation techniques that can be used, some more appropriate than others depending on the particular data item.

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