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In a database system, it means validity of your existing data. it refers whether your data is correct or not, only one mistake while entering data can lead it to corrupt data. some protocols are used to get rid of wrong data such as input mask.

E.g. while entering "dates" someone can write date in the way 01-02-2012, some other can write the same date in this order 02-01-2012 and it is also can be written in full February 01, 2012. so this can spoil record and also while making query you might get incomplete or wrong data. this is the reason it is most important in a database system.

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