What is one of the common ways to use controls for validation?

Using required fields for validation is a common technique because it ensures that essential data is collected before a form can be submitted. When a field is designated as required, users are explicitly informed that they must provide input in that field; otherwise, the system will not allow them to proceed. This approach minimizes the risk of incomplete submissions and guarantees that critical information is captured.

Required fields are particularly effective because they can be complemented by visual cues such as asterisks or highlighted borders to make it clear which fields demand user attention. This method is straightforward and intuitive for users, enhancing their interaction with the form while reducing errors and improving data integrity.

In contrast, merely using editable form elements does not inherently validate any data. While changing field colors can help indicate issues or draw attention, it does not enforce data completion. Mandatory buttons imply a requirement for user action but do not pertain to the validation of input fields themselves. Thus, required fields stand out as a widely accepted best practice for ensuring necessary data is included in user submissions.