What is the difference between "required" and "[Required]" in C# 11?

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In C# 11, "required" is a new contextual keyword introduced to indicate that a property, field or parameter is mandatory and must be assigned a value before it can be used. It is used in combination with the "init" keyword, which indicates that the property can only be set during initialization.

On the other hand, "[Required]" is an attribute that can be used in code to indicate that a specific property or field is required and must be provided with a value. It is mainly used in data validation scenarios to ensure that required fields are not left blank or null.

In summary, "required" is used to declare that a property or field is mandatory, while "[Required]" is used to provide metadata that can be used for data validation purposes.