Stop search engines indexing urls/pages

How can I stop search engines Google, bing and yahoo etc from indexing anything within the backend application, just like Wordpress wp-admin doesn’t get index none of it’s pages/urls/actions


I think a start would be google: "robots.txt"


Thanks I was quite vague I guess, is robots txt all that is needed or is it also recommend to add noindex in meta for all the pages.

Your site though a Google would have solved my question I’ll post no final solution anyway.



Since my applications are all used in a LAN and are not accessable from the internet - I’m also not sure if that is enough.

I just found this:

And after reading this article I would recommend to add noindex also.

(Like described in the article with an .htaccess file)