Before trying to define the term of eMarketing (or electronic marketing , so to speak), we should first take a look at the premises of its apparition and development.
The theories concerning eMarketing have not been unified yet, due to a large diversity in specialists' opinions. Still, one of the aspects that is established and has ceased being discussed in contradictory, is the fact that electronic marketing first appeared under the form of various techniques used by companies distributing their products through online channels (Internet ? based). That happened back in the pioneering age before 1995. These companies that opened the road were called "e-tailers", as opposed to the traditional retailers (also known as "brick-and-mortar" retailers). During their limited life, these electronic retailers began to develop and frenetically introduced new marketing techniques based on the support offered by the internet.
The online technologies mentioned above developed in the context created by the e-tailers , they are widely used these days by B2C and B2B organizations. In other words, they evolved towards what we call now eMarketing (you can also spell it e-Marketing if you wish, the "e-" stands in both cases for "electronic").