If i geo target on united states a .com domain. I will lose a part of my traffic for all the other countries?
Not sure tbh. It shouldn't as it should just mean you can make it known say a .co.uk is not just for a .co.uk audience or to be returned just for searches on Google.co.uk as opposed to Google.com which tends not to give .co.uk results unless you specify UK in search queries. I take it you are talking about the geo targeting thing in webmaster tools yes? I have been thinking about making a number of my .co.uk not just for UK but have not looked too deeply at how this works yet but had similar concerns. Need to take a lok at the settings and wording and carefully pick through to suss the impications IMHO, as it could well have an adverse effect, as in like your concerns, which I remember thinking might be a result of specifying such things when I did take a quick look at it (and noted it as something to get back to when it became more important for me to do so) a while back. Not a lot of help but if you need help picking through the wording, grab what you are seeing and we can pull it apart word by word.
Yes, through google webmaster tools Well, the idea was to geo- traget a .com domain to the united states. ( the entire website) anyway the website is in English and the client wants mostly us visitors because has banners from UniteD States on it, he doesn't care about the other countries. Anyway my concern is, it really boost the traffic from US? or just a little and i lose all the traffic from the rest of the world?
Its not mean for lose the traffic from other countries. It means we can focused US and our website is targeting in US. But we can get more traffic from other countries too..
If you want traffic from all other countries then you can target on all the countries, If you want traffic from specific region then you target that particular region in Google webmaster tool.If your Geo target is united states than you definitely loose the traffic of all other countries.