Search engines give internet users the opportunity to find websites and other documents in the World Wide Web. After typing in a search term into the search field the search engine delivers a list of links to webfiles. Search engines try to arrange the results by relevance with an algorithm. Search engine market is dominated by Google. The most popular search engines are (sorted by worldwide market share)¹⁾:

• Google
• Yahoo
• Baidu
• Bing
• Ask