HTTP Status Code 422 refers to Unprocessable Entity. This status code indicates that the server understands the content type of the request entity and the syntax is correct, but it was unable to process the contained instructions.
Typically, this status code is used when the server cannot process the instructions due to semantic errors. For example, when a client submits data that fails validation checks or business logic requirements, the server responds with 422 to inform the client that the request was well-formed, but the contained data was not acceptable for processing. This is often seen in APIs where client-side data validation is essential.