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"  Danielle Gold, one of our summer interns, has been amazed by the breadth and depth of what we test here at the Good Housekeeping Research Institute. While we have experts in everything from tech to health to textiles to home care, even our pros consult outside resources. And that&amp;#039;s where search engines come in handy. In the past, we&amp;#039;ve praised Google and its counterparts for helping you to find out about everything from free appliance repairs to local events. But have you ever wondered, &amp;quot;Why are search engines like Google, Yahoo, and Bing so good at finding the web resources that you need?&amp;quot; Here&amp;#039;s what Danielle found:  They analyze it. Search engines use computer programs that &amp;quot;crawl&amp;quot; the web. They extract key words from content and give priority to web stories with the most links and that link the most to other content. The web sites that share the key words you&amp;#039;ve typed into the search box and get the most traffic will appear at the top of your screen. They customize it. Popular search engines have built-in tools to help get you what you want quicker \u2013 like having a built-in spellcheck to more accurately get you what you want. You may have noticed that when you type in an equation, Google recognizes it and a calculator quickly shows up in your search. Search engines follow a similar approach when it comes to sports scores and weather with built-in widgets for quickly displaying the desired info. Search engines also use your location and search history to predict which sites you might like best.  They profit. Relevant pay-to-click advertisements appear on the side and top of the browser. Also, some search engines, such as Google Shopper, list only websites that have paid the search engine. They allow you to maximize results. There are quick tricks you can take to make your searches more effective. Google&amp;#039;s Advanced Search feature allows you to customize your terms and can make for better results. Or you can use Boolean operators, key symbols that refine your search. Google has a support page dedicated to helping you use them. Use a dash before a word to exclude it from the search. For example, if you&amp;#039;re looking to buy a pair of Puma sneakers, you can type in &amp;quot;-cat&amp;quot; and it won&amp;#039;t give you any references to the wild animal. For more information about search engines, read Rachel Rothman&amp;#039;s post on which search engine to use. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/institute/a24600/how-search-engines-work/>