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What are Web Crawlers and How do Search Engines Work?
The majority of internet website traffic today is delivered by the major search engines, this traffic includes, customers, information seekers and potential customers. Having a basic understanding of how the search engines work and how they display their search results may help you to improve your website ranking.
Ever Wonder How Search Engines Work?
Search engines utilize what are called spiders, also known as crawlers for indexing websites in the search results. Spiders or web crawlers are basically software scripts that fetch information from the world wide web following all the links it finds. Once a spider finds a web page it reads all the content and meta tags on that page. If it sees a link on a web page it will follow that link and index that site also. All of the data that the spider collects every day is housed in a big central database or index. One fact many people overlook is that search engines index individual web pages, not entire websites. A few search engines will only index up to 500 web pages for any given domain or website, so you may want to keep that in mind and not build more than 500 pages.
Search engine spiders return to already indexed pages on a frequency set by the search engine administrators in order to check for any changes or updates it may find on a web page. Spiders may index up to one million pages per day. You can think of the index as a large book containing a table of contents, the actual content and any links, etc. that it finds during a crawl session.
Example popular search engines of today: Google, Yahoo and Bing (MSN)
When a search term is entered into a search engine, the search engine searches through its own index in order to display relevant search results for that term. Since each individual search engine uses a different algorithm for producing search results, a web pages rank may vary significantly from one search engine to the next.
The inner workings of the search engine algorithm's are usually kept a secret from public knowledge. Basically, they scan for location and frequency of keywords on a page. Also known as keyword density, if there are too many of the same keywords, this could be considered spam and the search engine will punish that website by de-indexing it. Algorithm's also analyze all the links on a website and the anchor text used for the link. When web pages link to each other and have similar or relevant content, this will increase the power or rank of the page which will in turn improve search result position. You should now have a basic understanding of how the search engines work.
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This entry was posted on Sunday, January 22nd, 2012 at 12:29 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.