Well, the short and easy way to answer this question is “Google.” But obviously, there are more search engines - some more important than others. The pie chart above shows which search engines are the most used. This is based on a report from Nielsen Online in March of 2009. (If you are having trouble seeing it, you can click on the chart to get a bigger image.) As you can see, Google, Yahoo, and MSN/Bing/Live are the top three. Why is all this important? Well, it’s good to know which search engines are best to focus on to get ranking for your website. This is really a personal goal you need to set, but I don’t really worry about any other search engines besides Google, Yahoo, and maybe MSN/Bing. But again, this is a goal you must set for yourself.
Google is still very popular but Bing is slowly catching up.
Yes, Bing is catching up and may one day win. Bing’s partnership with Yahoo will really help them but they still have a ways to go before overtaking Google.