There are two types of people. One type of people is following the ideas called "Open Source" and another one follows the ideas of "Free Software". There is a third concept that I will hope to explain in this article, called "Paternalism", that in my opinion is the dividing force between the two camps of people.
Both "open source" and "free software" mean, in terms of software itself, largely the same thing. The source code is published. The project is developed by a community of people. The project is forkable. Many pieces of software are both "free software" and "open source" in the same time. But when you dig into the details of their definitions, you start to see differences.