Search Engine - a utilizer interface program designed to probe and exhibit information according to the utilizer's query.

Types of search engines:

  • ecumenical - intended for probing information on the Internet;
  • local - probe the local network or concrete accommodations.

We distinguish the following ecumenical search systems:

  • Macrocosmic - search engines give users the competency to probe for content of any type: text, graphics, audio, video. The search itself takes place in network resources. The world bellwether among search engines is Google. Beyond him, quite familiar are Yahoo !, Bing, Yandex, Baidu. In Poland, the Google search engine fortifies about 98% of queries. In integration to its own accommodation, the company provides accommodations to clients such as, and;
  • specialized - their job is to find information that meets categorical requisites. These are file search systems on FTP servers, online store goods, information in Usenet (ecumenical news system);
  • thematic - search engines of this type are probing only for information on the Internet that may be of interest to certain convivial groups (religious, professional, etc.).

Search engine structure

The term "search engine" is generally understood as an ecumenical, macrocosmic search engine and will perpetuate to refer to such systems. The structure of most search engines is homogeneous and there are no consequential distinctions between them.


The component of the search engine that you visually perceive is a web page with an interface for querying the search engine. There are withal search results for your query. Software designed for indexing and probing information search algorithm; Database of website addresses and information about internet and intranet resources.

Search algorithm is an active part of the search engine, and its tasks include:

  • indexing of accommodations and their content;
  • ranking of websites and accommodations;

Composing search results.

A database (index) used to store kenned search engines for accommodation addresses and their pages, as well as content, links and other information contained therein. The index is subdivided into chapters and placed on many servers located all over the world (for astronomically immense search engines) connected to the network.

Principles of search engine functioning indexation

The search algorithm works perpetually 24 hours a day by scanning the ecumenical network for incipient resources, by going through the links found on them, and by integrating (indexing) incipient addresses and information to the database (index).

Parties subject to indexation should meet certain requisites for:

  • uniqueness and quality (correctness, informative value, structure) of content;
  • quantity and quality of links leading to the page;
  • utilizer activity on the site;
  • no malware;
  • Compliance with concrete requisites (for example, the enjoinment of the publication of infringing material, the incitement to terrorism);
  • Compliance with categorical page situating policies.

Engender a page ranking and exhibit search results

In replication to a utilizer query, search robots scan the index of the search system, find and suggest to the utilizer the addresses of the pages in which the query word or coalescence of words is a key phrase. If keyword phrases do not match the query, the search engine culls pages with the most kindred content. Since conventionally the number of pages that match the query is profoundly and immensely colossal, afore the search engines becomes the task of piling up from those pages the germane ranking. In other words, because search algorithms need to provide the utilizer with the most pertinent answer to the query (which is not generally possible due to the brobdingnagian amount of search queries), the search engine has decided to exhibit results in an orderly manner. The form of ranking list of addresses, the bellwethers of which are the accommodations with the best parameters, and further in the directory are placed sites with increasingly worse bespeakers. Search results are a list of web addresses. Withal, there is a brief text about the page content, the soi-disant snippet.

Penalties imposed by search engines

In the case of search robots finding search engines utilizing unlawful techniques, the following sanctions may apply:

  • lowering the page rank;
  • Abstracting a page from the index, the soi-disant proscribe.
  • Unauthorized and unlawful techniques that may lead to the utilization of search engine penalties include: ebony SEOs, unauthorized content distribution, malware distribution, etc.

Priorities in search engine development


The perpetually growing number of pages puts the system down


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