Inbound Marketing is a word that has become quite promoted since 2007, mainly by a company called HubSpot. But the more we study Inbound Marketing, the more it becomes evident that it is only a well promoted and clever commercial use of Content Marketing.
However, digging deeper into the situarion, Inbound Marketing and Content Marketing are both special cases of Digital Marketing. Researching all three terms with the help of Google Trends, the situation is as follows:
In the Digital Marketing world, the growing popularity of Content Marketing over Inbound Marketing is evident. For more details, please click on the Google Trends link, under the graph.