Final answer:
When a data validation rule is broken, a validation error message is displayed to the user, indicating the need to correct the data entered.
Step-by-step explanation:
When the user enters data that violates a data validation rule, a validation error message appears. In the context of computer applications and databases, data validation is a critical feature that ensures only appropriate and expected data is entered into the system.
This process maintains the integrity and accuracy of the data stored. For example, if a user tries to input letters into a field that expects a date, a validation error message prompts the user to correct the input.
Similarly, if a user enters a number outside an accepted range—such as a percentage over 100%—the validation logic triggers an error message to prevent incorrect data entry.