Great thread,

Marketing comprises all the actions a company or individual undertakes around creating, promoting and selling their products. Internet Marketing then means to use the Internet to either advertise or sell products/services with the help of the two most important Internet Marketing tools, websites and emails.
Or - stated extremely simplified - Internet Marketing is all about making money online.

There is a multitude of ways to accomplish this goal such as selling of physical or digital products via one’s own website or auction platforms, affiliate programs, CPA offers, membership sites, AdSense and other ad publisher programs, lead generation, mentoring programs and others.

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Internet Marketing Dictionary, Internet Marketing Terms