what are 301,403,404,500 error for?

[mishellrogen]

hi guys, i searched many times to find the correct answer ,but i didn't get it.so please tell me what does these errors stands for?

[chizy2]

http://www.checkupdown.com/status/E301.html
http://www.checkupdown.com/status/E403.html
http://www.checkupdown.com/status/E404.html
http://www.checkupdown.com/status/E500.html

Here is what each one is for.

[pritaeas]

Official documentation.

[tinjuashok]

301 redirects are used to permanently move a site to a new location. Search engines do not apply penalties to 301 redirects the way they apply them to many other types of redirects.

403 Forbidden is the HTTP status code produced by a web server when you are not permitted to access a particular URL. Usually a 403 Forbidden error means that the page in question does exist but cannot be accessed by you.

404 is "Page not found error" or "Clueless"