Description: The validation rule is a set of criteria that data must meet to be considered valid. These rules are essential in the field of data management as they ensure the quality, integrity, and consistency of information. Validation rules can cover a variety of aspects, such as data format, allowed ranges, relationships between different data sets, and the mandatory nature of certain fields. For example, in a database, a validation rule might specify that the ’email’ field must contain a valid format and cannot be empty. These rules not only help prevent errors in data entry but also facilitate informed decision-making by ensuring that the information used in analysis and reporting is accurate and reliable. In software development environments, validation rules are often implemented through code, using programming languages and frameworks that allow for the effective definition and application of these constraints. In summary, validation rules are fundamental to maintaining data quality and ensuring that required standards are met across various applications and systems.