Google is the world’s most popular search engine. More than 60% of Internet users around the world use Google to search for information, products, or services. Google’s popularity stems from its minimalist design and the relevancy of its search results.
When a user visits Google.com, he enters a keyword and presses the Google Search button (this is called a search query). In response, Google displays a search results page, which lists web pages relating to the search query. The most relevant page appears first, followed by the second most relevant page, and so on.
How does Google know which results are most relevant? The answer lies in Google’s algorithms, which are a set of advanced calculations that help identify the relevancy of results to each search query. Google crawls the web regularly, indexing billions of web pages – similar to the way a library card catalog indexes books. When a user enters a search term, Google scans its vast index and displays the most relevant pages based on PageRank™ and other advanced algorithms.
PageRank™ relies on the link structure of the web as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But Google looks at more than the sheer volume of links a page receives; it also analyzes the page that hosts the link. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important".
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