A practice of optimizing one’s website to increase the two important factors – quantity and quality of its traffic from a search engine’s organic results. What does this benefit? Free, passive traffic to your website, month after month and thus leading to growth of customer visits. For you to understand how this works, let us see how search engines actually work… The internet’s search engines are the modern libraries for the digital age. When a person types their query on a search engine, it looks through all the pages in its index and tries to return the most relevant results.