HTTP status code is a server response to the browser's request to indicate whether or not that request can be fulfilled. Here in this blog post read in the detail What are HTTP Status Codes?
What are HTTP Status Codes?
HTTP status code is a server response to a browser's request. The status code provides information about the request. It also helps to identify the cause of the problem when a web page or other resource does. HTTP status codes are generated by the server that's hosting the site when it responds to a request made by a client. HTTP status codes are not actually part of the site's content. Here is reading in detail What are HTTP Status Codes?
