I think you are talking about Google adsense Click. It means if you are displaying adsense on your website and visitor have clicked on those ads to visit the sites. Then that click is known as google click.
Google Click? Never heard about that.. May be something related to Adwords Pay Per Click? http://www.google.com/search?hl=&q=...avclient-ff&rlz=1B3GGLL_enIN377IN378&ie=UTF-8
What a Question!!!! you have already put seo company sites in your signature, it's mean you are expert and this is general question, Really i am not satisfy with you knowledge here, I'm sorry if i hurt you. anyway, you have got good answer above by johntli