When I tell people I work for HubSpot many of them, particularly in the marketing and tech world, nod their head indicating they know all about HubSpot and Inbound marketing. Many have even read Inbound Marketing, the best-seller by Brian Halligan and Dharmesh Shah.
So ask a few questions on the topic and you'll likely hear "Oh sure, it's basically SEO" or "Yes, I know all about content marketing and driving conversions with landing pages, marketing automation etc."
I too thought this way but in the last few months I've come to realize that all this is just the mechanics of Inbound Marketing and misses the most important concept on why this methodology works. And understanding the why is essential to doing marketing and, perhaps even, business right.