Dictate what field within the content model is required, down to how a particular field should be formatted. This guarantees that the most important inputs are never forgotten or entered incorrectly.
Define custom validations per field with a predefined set of validation methods or fully custom using regular expressions. These validations are available on most fields where customization is possbile.
The validation rules will be checked in the CMS interface directly, and even when using the mutation API.