What is the purpose of a required field in an online form?
The governing concept is data collection and completeness in an online service. A required field marks information that the system needs before it can accept, process, or submit the form, such as a name, contact detail, or identification value. If the field is blank, validation normally asks the user to complete it. It does not make information public, decorate the page, or change its colour. Hence, option B is correct.
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