What does 400 Bad Request Mean?

The "400 Bad Request" status code is an HTTP response indicating that the server could not understand the request due to malformed syntax or invalid input. This typically occurs when the client sends a request with incorrect formatting, missing parameters, or unsupported data.

For example, if a user submits a form with incomplete or incorrect data, the server might respond with a 400 Bad Request to inform the user that their request cannot be processed. This error helps ensure that the client provides valid and properly formatted information before the server can process the request, maintaining the integrity of the system.