1.4. A Note on Terminology - Free Versus Open Source
This is, first and foremost, a textbook about how to create software collaboratively, using a community development model.
There are valid reasons for the usage of these different terms in different contexts, but for the sake of simplicity, we use the term FOSS primarily in this book, with the tacit understanding that all terms mean virtually the same thing in our chosen context.
Enough of the pep talk. It's time to get started.