Internet marketing simply means marketing on the internet. ANY activity you do online that's ultimate goal is to increase your revenue is internet marketing. Inbound marketing is simply another name for content marketing, which is distributing content (in various forms) that's designed to get people to visit your website.
Internet marketing is more than just lead generation and lead capture, although that certainly should be a large part of your marketing efforts.
Like said, internet marketing means lead generation , marketing on the internet, whereas inbound marketing means content marketing. Internet marketing has a lot of more benefits over the inbound marketing, that is the traditional type of marketing and it is on an increasing trend now. I recently read a blog by MJM Media, a video production company in Toronto, where they are discussing about inbound marketing and traditional marketing, and why world's outbound champion are switching. Hope this helped you.
While these terms are often used interchangeably to no avail, they each carry their own distinct meaning. Knowing how to correctly define these marketing styles is key when approaching other businesses, or executives within your own business, with new marketing ideas.
Generally, inbound marketing and digital marketing are unique in two distinct ways:
1) Inbound marketing is an entire marketing methodology, while digital marketing is a broader term for elements used to digitally connect with consumers (often in the form of visual overhauls, graphics or logos).
2) Inbound marketing consists of countless moving, interrelated parts, (blogging, content offers and conversion elements, to name a few), which take a steady balance of time and expertise to implement correctly; digital marketing, on the other hand, is the practice of marketing to users across digital platforms with elements like banners, brand recognition and advertisements.