There are a lot of types of software, but not all the people know the differences between their.
In order that they remain clearly framed the different types of software, I put this Venn’s diagram of the diferent kind of software that exists in the market:
In the diagram we can see that Free Software and Open Source are practically the same, contrary to what many people think. You can also see that the Free Software or Open Source, are not necessarily free-download software (or freeware), ie with zero cost, there is a myth of Free Software. In order to define all the Free Software we have the concept FLOSS (Free/Libre Open Source Software).