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When the client's request is not correct in terms of syntax in Spring MVC, it means that the request sent by the client does not conform to the required syntax or format. This can occur due to various reasons like missing or incorrect parameters, invalid data formats, or incorrect HTTP methods. In such cases, the server will respond with an error message indicating the type of error encountered, such as "400 Bad Request" or "422 Unprocessable Entity". It is important for the client to ensure that its requests follow the correct syntax to avoid such errors and ensure successful interactions with the server.