What is the purpose of data validation?

The purpose of data validation is fundamentally about ensuring that the input data is accurate and meets established requirements or constraints before it is processed or stored. This step is crucial in maintaining data integrity and preventing errors from propagating through a system.

Data validation checks for various factors, such as format, type, range, and adherence to specific rules. For instance, it can ensure that a user enters a valid email address format, that numerical inputs fall within a specified range, or that required fields are not left empty. By integrating data validation into input processing, systems can minimize the risk of incorrect data leading to errors in calculations, reports, or any downstream processing.

The focus on accuracy and adherence to defined requirements helps ensure that the data used throughout an application is reliable, which is an essential aspect of effective data management and application functionality.