How Search Engines Work
The understanding of main principles of how search engines work and their architecture is very important for the right website construction and its better optimization for search engines. Read in this article about search engines crawler, spider and how the work together.
They all contain the following main components: Each search engine has its unique structure implementations and algorithms for searching over the WEB. But principles of a search engine work and components that any search engine contains are the same. In order to achieve best SEO your need to be aware about these components that arrange the search engine as one whole mechanism. Let consider these components its predestination and main features according to the order of their inclusion into the search process.
The Spider component is a program responsible for web page downloading and its reading in a web-browser manner.
The component called Search Engine Crawler is a program that explores all of the links presented on each web page. Actually this program automatically follows all these links. The main mission of the Crawler is to detect where the Spider program should travel in order to evaluate the links. The Crawler follows these links and attempts to discover after much searching what the documents that are not known yet to the search engine.
The next search engine component is Indexer - a program that performs advanced analysis of web pages previously downloaded by the Spider. This program responsible for parsing of each web page and analysis of the different page elements, such as specific HTML symbols, titles, headers, text in connection to its stylistic characteristics, etc.
The next component is a search engine's Database. Database is a memory space where the search engine stores all downloaded and analysed pages. This database is periodically updated by a search engine. It is also called the search engine index.
The Results engine is component that responsible for search results extracting from the database. It is also assigns a rank to each pages. It decides which pages more compatible with a search query and manages the order of the web pages presentation on the SERP. The order is arranged according to the algorithm of page ranking. The page ranking algorithm is unique for each search engine. The pagerank is most important property of the web page. Any website owner is pay most attention on the pagerank of his web resource and trying to increase it in order achieve best rank in search results. Use the SEOnlineLab.com Rank Checker tool for monitoring your site rank for the major search engines: Google, Yahoo and Bing. Our SEO Metrics tool will also help you to monitor important and useful information for your internet site indexing and will helpful for your website promotion.
The last search engine component is Web server. This is a server that accomplishes the communication between the user and other search engine components considered above. In the responsibility of the Web server is displaying of the results of search in the page of HTML format.
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