Google analytic stat

I am using Google analytic for my website traffic stat purpose.There I have noticed some traffic from different Google site.Such as "Google.co.in","Google.au" etc.But these traffic are treated as referral traffic.But I have visited those site,they are simply a search engine from different country.Then how they refer a traffic for me.Again there has no keywords search for it,so it can't be treated as organic traffic.

I am confused about those traffic.how they come,how they find me,who are actually referring them to me.