by Filipe Martins

Created on: April 22, 2009

To dig a hole in the garden you a hole and a USA man, not a fork and a soup spoon, right? Web is the same thing - there is a search engine for each type of content. Start to focus more on that item, record the names of other search engines in your favorites or mark on your calendar - at some point they will be useful for you.

I will explain in summary form: the search engine can be divided into three main types - directory, search and metasearch robot.

Like directories, also known as web directory, come to search the sites that are carefully organized by humans and have divided their searches by topic or categories targeted. When a site is registered there, the content (subject) of each page contains many specific weight category in which it was included - the higher affinity, the greater the relevance on the results page. The Dmoz is a good example of a web directory.

A search engine such as robot to search, also known as a crawler or spider, and the Gigablast has a virtual robbery that visit your site automatically for each catalog of the pages and insert them in the database without any human intervention. To get a better relevance in the classification reported in this type of search engine, you should use instructions called meta tags, preferably on every page of your site.

Already a metasearch such as Dogpile or Clusty for example, comprises a single search engine, simultaneous access to several databases, almost always returning a page with the mix the results, and summarized in a practical way.

Besides the types of search engines, we can target the classification of these tools, based on the main focus of activity. Those that are more familiar and use the general search engines they crawl the web in general, without any refinement or restriction established and implemented.

With the arrival of Web 2.0 - which resulted in a large interaction between the users - to demand more of the search engines. Preferences require our new interactive content or other file formats than HTML: video, audio, presentations of work, PDF documents, high-definition photos, podcasts, feeds, and content for mobile devices.

This happens when we use specific search engines, vertical or thematic - the answers are much more accurate. Try the Truveo to download videos, the Kartoo metasearch that innovation in visual graphics, the Chacha if you want to help guide people, the Ditto to find photos, the Hakia search for meaning or semantic, the Boing browser for mobile devices, the AnswerBus search engine for language natural , the Ms. Dewey a viral from Microsoft as an interactive visual browser with the Seeqpod or Musicovery for audio files.

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