I can dig it. SEM encompasses much more than just PPC and SEO. I believe that SEM collaborates multiple aspects of digital marketing, but also considers the testing, optimization, and improvement of an overall campaign.

I do agree with Chris on this in the regard that PPC and SEO are just a potion of what is involved with a SEM campaign. It takes more than just those two elements to develop a strong campaign. Keep in mind that conversion tracking, optimization, and tweaking a campaign are all things to consider. Some aspects of digital marketing are not necessary for a SEM campaign.

Well, after first looking at your post I would consider grammar to me of utmost importance. I would also suggest writing for the country you are from. Most people I have outsourced to don't know of the subtle nuances that come from the USA. The same would be true if I were to write for another country. My American accent wouldn't sound quite right.