Status codes are numbers returned by the server with every response.
They tell whether the AJAX request was successful or failed.
The status property contains the HTTP response code sent by the server.
The most common successful status code is 200.
It means the request was completed successfully.
Status code 404 means the requested file or resource was not found on the server.
Status code 500 indicates a server-side error.
This usually occurs due to coding mistakes on the backend.
Developers must always check status codes before using response data.
Handling status codes helps prevent application crashes and improves reliability.
After completing this lesson, you can correctly identify successful and failed AJAX requests.