how adsense ads shows in our website i mean the topic of the ads what google see in our site and then show the ad related to it like Title Meta Keyword Meta Description etc
didnt understand - if the question is how it shows ads.. well it checks on the key words of the site and the contents of it( see what type of ads are best suitable) -- i have seen it in my blog when i read post about webhost they showed about webhosts and when i posted about an anime they showed ads about anime sites
Yes, Adsense engine goes through the content on the page and then show relevant Ads. It can take into account meta tags but mainly it is the content which matters.