Web directories - Development and Outlook

Development: Not until nearly the end of the last millennium were web directories important part of the World Wide Web. The editorial care specifically for users, providing them with the information. However, it often took a long time until new websites in the lists. Yahoo directory has long been the most widely used web catalogue. In 1998, the Open Directory Project (ODP) or DMOZ (Directory at Mozilla). This `open content project 'was an attempt, through voluntary international editors waiting times up to be included in the list as soon as possible. Today is DMOZ with well over 5 million entries one of the largest web catalogues in the world ...

Outlook: The importance of web directories and web catalogues has greatly diminished. The majority of Internet users seeking information or data with the help of search engines. Yahoo directory, the very foundation of the company, has been a long time hardly cared. Even the ODP had repeatedly intervening difficulties, especially technical nature

In their place are some commercial directories underfoot, the only one registration fee. Besides some new visitors to these directories often provide some strong backlinks, through which registered in the results pages of search engines increase. A really noticeable effect on the ranking of a Web page, the DMOZ and possibly the Yahoo directory. If a page e.g. At DMOZ entered, as `trustworthy ', and it listed above. In future, the importance of some web catalogues rise again, as many new search techniques, such as Trust the Google Rank, manually audited directories as a starting point for its other ratings used.

Web directories - Explanation of terms

Web directories or catalogues are available on the Internet published collections of Web addresses, which sorted according to specific criteria. The editorial control will reach Webverzeichnissen listed in the references often higher quality than those generated by search engines results.

The quality, however, the quantity to the victims, because each site manually checked and must be made available. There are commercial and non-commercial, and hierarchical, that In certain categories and subcategories broken down, and not hierarchically structured directories. Moreover, there are web catalogues with or without a back link requirement.

Search engines - MSN or Windows Live

MSN (The Microsoft Network) is an Internet portal, which in addition to various services also offers a search service. The portal and the search is the future `Windows Live '. Microsoft was founded in 1975 by Bill Gates and Paul Allen founded. The name Microsoft originally meant `Microcomputer Software '.

Main source of income for the company is the operating software `Windows'. With an annual turnover of about 45 billion US dollars was Bill Gates reiterated its 2006 first position in the list of the richest people in the world.

The search service of Microsoft in Germany currently has only a market share of 3-5%. In the United States, he is somewhat higher, but even here, Google the market. The ranking factors are here, just like Google and Yahoo, external factors, together with the contents of a page in the first place. The link and domain popularity is not as strong as the other two search engines evaluated. The occurrence of the search word in the domain, in the title, in the description and the text is expected to remain higher. The current low market share of the MSN / Windows Live search could soon change, because the newly developed search service `Windows Live 'on the part of the new operating system Windows Vista`' integrated ...

Search engines - Yahoo

The company `Yahoo! 'Was founded in 1995 by David Filo and Jerry Yang founded. What initially only a simple link list of two students has been, is today, with over 350 million users, 7500 employees and a turnover of several billion US dollars, one of the largest Internet portals in the world.

Among many services (e-mail, dating, etc.) offers this portal Yahoo on a Web catalog, and a search service, Yahoo `search '. While in the first years of editorially led Webkatalog greater importance, is the current focus mainly on the development of the search service. For this reason, Yahoo bought 2003 Overture and Inktomi. Along with the technology, a new, own and independent of Google search service. Yahoo ended in early 2004 to work with Google. Since Yahoo uses its own algorithms and indices.

The ranking factors, after which the results will be listed, however, are the factors the search engines like Google. Link popularity and individual content is also top priority. Yahoo has with its search service in the German market accounted for 3-5% ...

Search engines - Google

Google is, as already described, an Internet search engine, which in 1998 by Larry Page and Sergey Brin was developed. The origin of the word Google is in the 1938 invented by Milton Sirotta expression `googol ', which for a one with a hundred zeros. The founders of the search engine and the same firm Google Inc. chose this phrase in reference to the unimaginable size of the Internet. In 2005, even the Duden the verb `Googling 'in his words.

Meanwhile, Google Inc. is one of the world's most influential companies. With a market value of more than 150 billion US dollars, the two founders, at the latest after the IPO in August 2004, with the richest men in the world. They employ more than 10,000 employees. Google Inc. The company operates worldwide many data centers. A query to optimize search speed, always to the nearest computer center. Only in this way can answer periods of a few tenths of a second guaranteed.

The listing of search results, so the ranking, according to a specific algorithm, which is constantly expanded and verified. One of the most important criteria by which the results are sorted, the PageRank. The PageRank defines the `value 'of a Web page based on the number and quality of incoming links. This value is in a scale from 1 to 10. Other more or less important criteria include The content and relevance of a page, the domain name, Title and Description tag, the structure of content, outbound links, old texts, the listing of some major Webkatalogen (DMOZ), the age of a page, and many more .

Experts estimate that the Google algorithm from several hundred individual elements. Because Google with over 90% market leader among search services, they need many of these criteria for a search engine optimization taken into account. For this reason, most of these factors in the course of the tutorial explicitly explained ...

Search engines - Development and Outlook

Development: Around the mid-'90s, the first search engines. The Internet and the World Wide Web had already at this time reached a size that the user is almost impossible, the information sought by him immediately to find.

With the first search engine was WebCrawler, Lycos and Alta Vista. Long time, the meta-search engine AltaVista, also one of the first commercial search engines, the market leader in its field. Today, however, there are almost no meta search engine, which successfully claim.

1998 developed Larry Page and Sergey Brin, were still students, a separate search engine. A simple, almost simplistic user interface and a previously unprecedented search speed were the basis for the later success of the search engine Google. It also used these algorithms and ranking criteria, which is not previously known. One of these criteria is the so-called PageRank.

Quick also saw Yahoo and MSN, two other search services that the new search technology of the search engine Google would prevail. As Larry Page and Sergey Brin are now all but patented techniques were, they did nothing other than to shop at Google. Today, even if a Yahoo meanwhile, has developed its own algorithm is the search engine Google absolute leader. Its market share is, take the search engine added, which is also the Google index, over 90%. Yahoo and MSN and Windows Live follow in the squares 2 and 3 They fail, at least in Germany, are much to the 5 percent hurdle ...

Outlook: Whether Google itself in the future as a market leader can say, it is impossible to say. That AltaVista today hardly anyone knows, would even a few years ago no one thought possible. Google could just as quickly a new technology developed soft. From one day to another, this can hardly happen. Google sees it, as no other company, to market itself. The key word is `branding '. Google is not just a search engine long ago, but a company, which in almost all sectors expanding. These include e.g. The special search services Froogle, Google Maps, Google News, the discussion forum Google Groups, an e-mail service (GMail), or communities like blogger.com or Orkut, a Personals. In addition, Google offers free software, such as Google Desktop, or the image editing program Picasa.

The main idea behind what these and many other new developments is, is simple. The name Google is gaining more and more in importance. There will be no more long sought, but only `gegoogelt '.

The search engine of tomorrow, we will by voice a search request. Likewise, it once they own all the relevant results and evaluated, with its own voice respond. This may, however, still take decades. Although there are already attempts and first results, but the language in context is much too complex than it really would be useful. Here are the problems clearly, the future development of a search engine must.

Apart from the ambiguity of many keywords or different grammar, above all, the rapidly growing amount of data a major problem to arise daily one million new websites, and many other websites are updated daily. Experts from these reasons, assume that the search engine of the future on specialized databases. In addition, the personalized and regionally driven search (Personalized Search and Geo-targeting) is always more important. So can not only save important resources, the search for the user is also simpler and clearer, because the search engine will be together with him `learn '...

Search engines - Technology

A search engine consists of the following specific elements: a Url server, multiple crawler (bots, robots, Spider), the parser and the store server.

The Url server manages Internet addresses (Urls), which is not yet in the index. Registrations of individual web pages to search engines will be mostly in the Url server. This is the data to the individual or the crawler.

The crawlers now convert each Url into an IP address in order to conform to the respective servers connect. To the duration of the transfer to shorten, and the server not to overload, opens a crawler often several hundred compounds simultaneously. If a connection problems, it can quickly and without much loss of time on the next connection access. Through this rotation procedure can only be a robot up to 30 pages per second. After successfully passing the crawler delivers the data of the site is the parser.

The parser now created by each HTMLSeite a simplified form and forwards it to the store server. A store server's task, in the pages contained information easier to extract. Included in the links are Url server, which contained text or terms are included if they are not yet known, added to the index.

The index is simply out of the Lexicon, the hit lists, and the repository. The Lexicon is usually in the form of a hash table collection shown all found the net terms. Only those terms, which are included in Lexicon, also provide independent search results. Each term, or any word of the Encyclopaedia contains a note on the appropriate Hit List. Hit Lists to every word contained references to the relevant pages in the repository. In the repository, the site is saved. At the same time, in the Hit Lists noted the importance of each site in relation to the various terms or keywords given.

To interact with a search engine to be able to use the front end or the Searcher. The front end is nothing more than the visible component of a search engine, so the user interface. If the user query, the Searcher one of the Lexicon and the Hit Lists created results list.

Each search engine uses its own algorithm, a method by which the results will be listed. This algorithm is the real heart of a search engine. It consists of hundreds of criteria, which will decide what position to a site about a particular query is listed ...