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robots.txt explained

1) Does every website have a robots.txt file?
2) Is every websites robots.txt file publicly accessible/downloadable - if so from where?
3) What is the point in them, for example if you have an entry in robots.txt for /admin - then if the file is publicly accessible then what has it actually solved? I.e. how are you any better off in hiding /admin from google if someone can download your robots.txt and then see you actually have /admin directory on the server?

I cant see the logic or what the point in adding entries in it are?
2 Solutions
No every site does not have one.  

It needs to be accessible so the 'bots can find it. The purpose of robot.txt is to tell the spiders not to index things.  Without direction they will index everything they find.  If you don't want the directory name exposed put it in a higher level folder and deny at the higher level

You prevent the public from accessing the admin or anything else with .htaccess

If you have something that is sensitive it should not be on the web server, because a hacker will always find a way to see it.

Ess KayEntrapenuerCommented:
1> no
2> yes typically-->   website.com/robots.txt
3> entries entered here are for the webcrawling robots. it will allow/disallow to crawl through certain sections of your website and index them into the search engines such as google, yahoo, bing

if you have certain pages which you dont want to be added to the search engine such as your admin login page, you might want to add it here, so that common folk will not see it when they search for you site

as far as true hackers, the lack of a robots.txt file will not stop them

you dont have to add all of the admin pages, only the first portal

once the robots stops there it will not go further through that page's links
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