In the world of Internet marketing, a backlink is an imaginary key that allows users to "find" your website, so to speak. Basically, a backlink is just like adding another page or link to your web page, or another "page," like a blog, to a website.
Backlinks are essentially content that helps to direct people to a website or blog. A simple search on Google for "guest post service" will yield hundreds of results, each of which gives a more detailed description of how backlinks can be useful in helping people to find you.
Linking is used to create pages that tell other users about what you are offering or promoting on your site. The concept of backlinks is much more widespread than most Internet marketers realize.
When search engines make entries on their index, it is typically because a site (and/or page) links to another site or page. Search engines want to reward those sites and pages that offer good, fresh, informative content, and backlinks are a way of getting that done.
Google's AdSense program has been used by many companies, including yours truly, to help provide lots of relevant backlinks. AdSense is a Google program that pays sites that feature advertisements for other websites based on how many visitors click on those ads.
The type of ads that you can place on your site depends upon the Google program you are using to pay for ads, but usually include things like this: text ads for products like MySpace, etc., images for games and other multimedia-based sites, pop-ups and other interactive ads. All of these ads may be chosen from the millions of ad options that Google offers.
In order to make money with AdSense, you must get a significant number of visitors to visit your site, and Google's system for choosing ads is fairly simple. All you have to do is choose the most appropriate ad type and make sure that your site has a high PageRank.
Just by making backlinks to your site, you are showing that your site is worthy of the ad(s) you are putting on your site. This is a very important aspect of the AdSense program.
Backlinks drive traffic to your site. When someone goes to your site, they are looking for something, or someone, and they use search engines to find what they are looking for.
Backlinks also help your website to get listed on search engines that get a lot of searches, like Google. Using the Google's listing various programs will allow you to make it possible for others to find your site.
PageRank is a complex topic, and I will not attempt to go into it here. However, if you take some time to look up Google's "Webmaster Guidelines"Google Webmaster Tools" you will quickly find out that your site will be ranked higher, and receive better traffic, if you place backlinks to your site.
If you want to use backlinks to help improve your rankings and traffic, you should make it a point to make the process as easy as possible for others to find your site. That way, it will be much easier for them to find you and to return to your site.