The Mysteries of SEO Episode 2

The term "back link" refers to an outside link on another site that points to yours. In the past any link from another site would have a positive impact on your site by the search engines. Because there were so many gimmicks developed in the last few years to garner massive back links to websites such as link farms, and irrelevant reciprocal linking Google began to develop a way to weed out links that were purchased, or had little meaning or relevancy.

Even though back linking is used to manipulate search engine popularity there are many very legitimate reasons for using the system of back linking. Finding web sites that have a common interest to your own who are willing to place your link on their site can get you extra exposure. When their visitors come to their site they will see your link and likely visit your site as well.

The fact that onsite links like that have such a perceived relevance to the visitor makes them a valuable marketing tool, but that perception of quality is also why Google works so hard to be sure they are real quality links. You will get higher ranking on a search engine for a number of truly appropriate back linking partnerships however if the sites linking to you do not share any common information or products Google will penalize you for the link. There are new programs in the works with Google where your site could even be devalued if the site that links to you is determined to be bad quality so it is important who you choose to link to, and also who links to you.

In the past many web site owners would open up multiple websites with the sole purpose of promoting one principle site. They would use the extra websites as a means of placing back links to the main site. Google now watches for sites that are created with the same IP address. Creating a large number of websites on the same IP address and putting back links on them to quickly develop a number of links is known as link bombing. That is not to say that you cannot ever link to your own website from a site you own. If there is a reason to show your visitors some additional information a few well placed back links are fine. It is when there are many links from each site all pointing to a single 'main' site that the search engines look at them suspiciously.
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Muddabir Aziz