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Digital marketing versus Internet marketing versus eMarketing?

I am often asked if digital marketing is the same as internet marketing. Well it’s little like brandy and Cognac, Cognac is brandy but brandy is not Cognac. From where I stand and I believe that this is how marketing people explain it.

Digital Marketing is the top level name/explanation of all including search, mobile, email and other related marketing efforts. Internet marketing falls under digital and under internet there is search, banners and email and under search there is organic and PPC.

So while search marketing is digital marketing and banner marketing is digital marketing then banner marketing is not search marketing, or??? You can now buy banners through Google PPC so banner marketing is also search because it's also PPC and you can buy banners through PPC.

Ok, but if I ad eMarketing to the mix? Is that the same as digital marketing? I give up!! Does anyone know this in as simple terms as possible? What is what and the relation between each? I know the people at The Institute of Direct Marketing know, maybe I should drop them a line?

P.s. Wikipedia says this "Digital Marketing is the practice of promoting products and services using digital distribution channels to reach consumers in a timely, relevant, personal and cost-effective manner.", but what do they know?