why Google is best the search Engine?

This is an odd question. some one is best in every field. Google is the best search engine. This is all that matters. This is similar to asking why some one is first in the class.

I mean how it became best search engine.There are many more search engines like yahoo, bing, alex, aol etc, why they are not best search engines.

Google made a quick decision regarding its Search Engine image and it concentrated most on it while helping advertisers through certain programs and so gained most popularity. It has better and shorter search web page than others.