SEO - A Brief Introduction

Search Engines Optimization or SEO is a package of measures to optimize the internal (HTML-code, structure, content) and external (quantity and "quality" reference resources) parameters aimed at improving the position of the site to issue a specific search queries. Briefly leave the question: What are SEO and a brief introduction to the work of the search engine. Search Engine consists of several components: spider, crawler, indexer, database and the most important component to our topic.

The most important component of search engine is – its results (the system of issuing of results).  We omit the analysis of all parts of the system and choose to focus on the latter. The system determines the output of results which satisfy the search query page and in what order should the issuance of the results be built. The criterion on which the system makes the final decision, constantly improving, is a major problem for all SEOs. 

The algorithms of various systems are based on the concept of SEO. Search Engine Optimization has its origins in the 1990s with the discovery and development of search engines, a "golden time" for optimization. Through search, the system relied on the content pages and other internal factors, navigation, structure, layout and competent internal links. It was easy to align the text (full HTML-code) in accordance with the requests, to find the resource through the search engine. 

However, such an algorithm has led to the massive search spam of web pages that do not carry, as a rule, any message or meaning but simply created in order to manipulate the search results. It all changed dramatically with the introduction of PageRank - the algorithm for calculating the credibility of the page, by the search giant Google on the scene. Since then, the internal factors started sharing a crucial role to external factors.