Data validation or Validation is the process of examining whether entered data meets certain conditions or limitations that users have provided.
- For example: Marks obtained in exam must be greater or equal to zero and less or equal to 100 for any subject having full marks 100. To specify this validation rule property must be set as >=0 and <=100. And if users input data beyond the rule, the data will not be accepted. So examining this is data validation.
Importance of validation:
- Because of validation, there is no chance of entering data beyond the specific criteria.