one more point i want to add in Rajan's Explaination is that data 
validation Keep your data consistent so that it can hold its actual 
meaning. Lets suppose age of person Can not be a text value it should 
always be in Numeric value so that we can perform any calculation on it.

Regards
Prince

On Monday, March 4, 2013 6:40:23 PM UTC+5:30, Manjunath Narayanappa wrote:
>
>  Dear Experts,
>
>  
>
> In what circumstance we can use data validation ??
>
> What are there advantage & useful in daily usage.
>
>  
>
> Thanks in  advance
>
>  
>
>  
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