Web Search Engines search for information on the World Wide Web and FTP Servers. The search results are generally presented in a list of results and are often called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Search Engines are not the same as web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.

How Search Engines operate: 

  1. Crawling / Spider (Web Crawler): web crawlers finds links and content on websites
  2. Indexing: is the process of storing information in search engine huge databases.
  3. Algorithms: used to calculate variance, algorithms are used for calculation, data processing and automated reasoning. This influences Google’s “Page Rank”.
  4. UI (User Interface): The user interface of a website.

Most Popular Search Engines include: 

  1. Google.com
  2. Bing.com
  3. Yahoo.com (Runs on Bing.com)
  4. Baidu.com
  5. Wikia.com
  6. Ask.com
  7. Alphawolfram.com (Computational Search)
  8. Tinyeye.com (Good for Photos, Image search)