Introduction
Imagine that you would like to find information on red widgets. Since you don't know any online resources for red widgets, you will have to use a search engine. How will you do this?
Most likely you will use either Google, Yahoo, or MSN. After searching, you will see a number of different things on your screen. The top section of your results will most likely display pay-per-click ads. This simply means that any link you find here was put here by somebody paying for it. You will also find these ads usually running down the right side of the screen. However, the largest section of the results page is in the center, where you will find the natural search engine results. You notice that there are thousands, if not millions of results returned. View the rest of this article
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