Hello , I like this pot for very interesting question Internet marketing is very broad team that includes the email marketing, affiliate marketing, PPC marketing, Search engine optimization, search engine marketing, etc, when Search engine optimization is subset of Internet marketing. Both are useful for getting online success. Internet marketing, also known as web marketing, online marketing, web advertising, or e-marketing, is referred to as the marketing of products or services over the Internet, on the other hand SEO is the process of getting back link for your site which helps you to get the good page rank in the search engine. Actually both are related with each one another.