The easy, and short answer is: SEO is free you don’t have to pay for SEO and you do for SEM. The long answer is a little more complicated (always is!), however, despite having similar features, they have completely different strategies and approaches. HammaJack’s Ian Hammond has tried to outline a few of the key differences in this article.
Bounce rate is one of the most commonly used metrics in web analytics, but it is also one of the most misunderstood. In this article HammaJack Co-Founder, Jacob Moran, explains what it is and how to interpret it.