Why are error codes on websites shown as 404 Not Found [duplicate]

1. Why is error 404 called 404?
2. Why is error 404 famous?
3. What is the purpose of error codes?

Why is error 404 called 404?

The first 4 of the HTTP “404” actually indicates a client error like a misspelled URL or a moved page. The “0” points to a general syntax error like a spelling mistake, and the last “4” indicates the specific error in the family of “40-” errors which includes “400: Bad Request” and “403: Forbidden.”

Why is error 404 famous?

The website hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken or dead link; hence the 404 error is one of the most recognizable errors encountered on the World Wide Web.

What is the purpose of error codes?

Error codes can also be used to specify an error, to simplify research into the cause and how to fix it. This is commonly used in consumer products when something goes wrong, such as the cause of the Blue Screen of Death, to make it easier to pinpoint the exact problem the product is having.