Presence Check - ensures that a particular piece of information must be provided or entered. It verifies that a field or attribute cannot be left empty or null., Restricted Choice - if you're selecting your gender on a form, this check might limit the options to "Male," "Female," or "Other," and not allow any other input, Range Check - defines acceptable numerical limits for an attribute. For example, when entering your age, this check may ensure that you can only enter values between 0 and 120, Field Length - sets a maximum limit on the number of characters or digits that can be entered into a field or attribute,

DDD Validation Checks

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