Magento is an ”open source” software, which basically means that you are allowed to view, edit, and contribute to the source code. A lot of people also think that ”open source” means ”free”. Although it is certainly true that most open source solutions are available for free, it isn’t a mandatory part of the open source principle. Looking at Magento we immediately recognize that, because Magento is available freely as well as in a paid for version. We’ll cover more on the differences between those versions later on.