Why am I here?

E-Marketing is growing very fast because of the proliferation of internet. but, I am not that familiar with the term of E-Marketing. Therefore, taking E-markting course (Host 4103) this semester will be a chance of better understanding E-Marketing.
I want to know the following three at least.
First, the basic information on E-Marketing.
Second, the Limitations of E-Marketing and Security concerns
Last, effects on hospitality industry.
When I know the E-Marketing inside out, my future will be brighter and shining.