How Search Engines Work

Search engines work with a number of different algorithms that can be referred to as "spiders" that search or "crawl" the web for sites that are relevant to specified keywords users input. While these algorithms become quite complicated and look at a number of different aspects of websites there are a few key components that search engine spiders look for in their searches. Some of the important factors for search engines are:

* Links
* Content
* On-Page Factors

Links

When one site links to another on the web this could be seen by a search engine spider as a vote for that website. In short, if site A links to site B, that is essentially a vote by site A for site B. The more links that come in to a site the more the site is seen as valuable content that may benefit a user. The larger power the site has that casts the initial vote (site A in my example) the more value the incoming link has overall.

Content

Content also plays an important factor for websites. Websites that have content that matches closely to specified search terms allows customers of search engines to have better user experiences. Search engines consider sites with high quality content to have more authority on a topic, just as individual consumers would go to the most experienced or knowledgeable professional for advice or quality service. The more authority a site has, the more relevant it is considered to be to a customer's search query to satisfy the customer's needs for the search.

On-Page Factors

There are a number of on-page factors that play important roles in search engine ranking of sites. Sites with good page titles and headers that relate to specified search terms, for example, tend to carry more weight than pages where titles and headers are unrelated to search terms yet their content is. Proper usage of H1, H2 and even H3 headers that relate to targeted search terms in web pages can help bolster web page ranking than those who simply describe the subject in their content.

Complex Algorithms to Combat Spam

In each of these areas search engines are constantly waging a war against link spammers that post links on a wide range of sites attempting to increase their relevancy to particular terms. Some website developers use this to their advantage to gather ranking in search engines and drive more traffic. To counter these rubbish links search engines are regularly developing more and more complex algorithms (with thousands of factors that affect search engine results) to search the web, ignoring or eliminating these shady websites.