Without a doubt, Google is the largest search engine. According to the latest statistics, Google has got more than 90% market share in Singapore.
Google's ranking algorithm takes into account approximately 200+ attributes when determining the position of websites in search engine results pages (SERPs). In April 2007, SEOmoz published Search Ranking Factors V2, a survey of 37 leaders in organic search engine optimization on the most important factors in Google rankings. Rand Fishkin, SEOmoz CEO maintains that 90-95% of what you need to know about the Google algorithm is contained in the study. While a year old, most of this information is still valid.