Google has country specific versions of the site. Like google.de. They work (find) differently, comparing with google.com.
Moreover, google automatically redirects you to your country specific page, does not mapper what do you enter in the address field. And this is not always what one wants. At least, this is not what I often want. Sometimes, in the end of local google page I see a link to "Google in English", but not always.
Therefore I was very glad to find out that one can use www.google.com/ncr to open google main page with No Country Redirection. What is also nice - it is easy to remember this URL.