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Discover how search engines operate. Leveraging the basics will help you understand how SEO factors into your website’s ranking.
The structure of search engines is broken into 3 main elements:
“Spiders” travel (“crawl”) across the internet, inspecting websites and all content on websites. They read and trace the content of a site and all links on a domain to create site maps. These maps are stored for later indexing and updating of websites in order to maintain databases that search engines look through for results.
This information is then compiled and cataloged for later use in algorithmic searching. These catalogs are updated on a frequent basis by crawlers in order to give accurate search results.
The information gathered by web crawlers is stored in a catalog that is unavailable until each page is viewed by the “Spider”. Without the index where all information that is gathered gets stored, the results would take a substantial amount of time to create because the “Spider” would have to seek that website to catalog it prior to showing the search result.
The index contains all websites that have been crawled by spiders. This information is categorized into databases that can be queried by search algorithms to provide results for the user.
The search engine software (each search engine has its own unique algorithm) is utilized to rank and display pages based on various components. These pages are given a rank based on the the search engines calculation of the relevancy of the site to the consumer’s search parameters. While each search engine uses a different algorithm, or method for calculating the ranking of each result, and the algorithms are closely-held secrets, the results are primarily derived from the following:
Here’s a quick recap of how search works, the video is short but covers the important facts we discussed above.