Google is the top search engine and all people and webmasters are trying to improve their web ranking in Google because of the traffic t can send to their sites.
Ya they are all correct. Google is the top search engine and everyone is trying to improve their ranking on Google. Google plays the most important role in SEO...
Generally the importance of google for SEO is the same as the importance of a king for monarchy. In other words no Google no SEO
Sitemap is same for Google as well as for Msn, as there is one site that is xml-sitemaps.com, on which you can generate a sitemap without any cost, it creates sitemap for every page of your site. Also, you can submit your sitemap on Msn so that it crawls your web site.
Google is also the most difficult search engine to satisfy, yet their search results are no better. I'm pulling for Bing to make a gigantic splash. It's a better Search Engine and its algo has less anchors on it.
Everybody tries to optimize their sites for google. Google crawling and listing is very fast that's why you can manage to get traffic in a short amount of time. As for yahoo it gets alot of time until you will get some traffic.