The conversion rate is the most important web metric in a commercial website. Conversions lead to sales, and sales leads to profits; this is why a good conversion rate is essential for long term business success. Yet this important web metric is often the hardest to figure out. SEO companies often ignore it, and leave it to the website owner to determine. This is not good, because SEO should not only be about increasing traffic from rankings; instead, a good SEO should also pay attention to the conversion rate.