Validation is an automatic computer check to ensure that the data entered is sensible and reasonable. It does not check the accuracy of data.
Validation type:
Check digit: the last one or two digits in a code are used to check the other digits are correct
Example: bar code readers in supermarkets use check digits
Format check: checks the data is in the right format
Example: a National Insurance number is in the form LL 99 99 99 L where L is any letter and 9 is any number
Length check: checks the data isn't too short or too long
Example: a password which needs to be six letters long
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