Internet directories are often in order to find the correct site, users access the directory – for example, Rambler Top100 (top.rambler.ru) or Bigmir Top25 (top.bigmir.net). However, users are not always interested in some broad themes – movies, music, literature, Sports and the like. Much more often the user wants to find on the Internet for something more specific: information about the work of Gregory Tyutyunnik; personal website Oleg violin; specification refrigeration showcases Diona pastry, Family Code Ukraine and all that. What to do in this case? It is in such cases and the need to use search engines, which, as evidenced by the slogan of the most popular Russian search engine Yandex, "There everything! ". "Internals" of search engines Before you start talking about finding information through search engines, it is worth a closer look at how search engines are built. This will allow us to understand the basic principles of their work, and hence, by becoming one step closer to the information we need, which they refer.
Primichanie: The user sees only the external design of the search engine and its search engines and "internal" remain invisible. Conditionally search engine can be divided into three parts. One of the parts – "Spider (crawler). This is a program the robot, which travels over the Internet and reviewing Web pages. Pages, which he revised, recorded in the database search engine (called "Code") in the form of words or phrases. Thus formed a huge database that allows you to learn which pages are relevant words or phrases.