What's The Difference Between SEO and SEM?

What’s The Difference Between SEO and SEM?

Oftentimes in our industry there are classifications and buzzwords that get loosely thrown about (don’t get me started on the term “inbound marketing”) without any real definitions getting nailed down as fact.  There seems to be some confusion in the search marketing industry about how the different terms for what we do all fit together.  I wanted…