Free Software was coined by (probably) RMS to highlight how users of such software are getting a number of _freedoms_: namely those to use, modify and share that software onwards (with or without their modifications).
It is in opposition to "restricted" software where you are restricted in all of those. (Copyleft software restrict others from adding more restrictions, which is defensible but some BSD proponents disagree)
Libre is, as many have said, just the Latin word for Free. You'd still have to explain what it means in this context.
"Open Source" has similar problems: many think that it's enough for source code to be available for inspection for software to be called "Open Source", but it is just a another attempt to market a philosophy under a particular name.
These constructs are created to have a special meaning to promote an ideology, and are thus usually capitalized in English. This is nothing uncommon, and attempting to use these—now accepted—phrases to mean something else is bound to cause confusion. So, just like you learn what a "programming language" or "HyperText Transport Protocol" is (yes, one transfers a lot more than just "HyperText" over it), if you are in IT, one should learn what "Free Software" and "Open Source" mean.
It is in opposition to "restricted" software where you are restricted in all of those. (Copyleft software restrict others from adding more restrictions, which is defensible but some BSD proponents disagree)
Libre is, as many have said, just the Latin word for Free. You'd still have to explain what it means in this context.
"Open Source" has similar problems: many think that it's enough for source code to be available for inspection for software to be called "Open Source", but it is just a another attempt to market a philosophy under a particular name.
These constructs are created to have a special meaning to promote an ideology, and are thus usually capitalized in English. This is nothing uncommon, and attempting to use these—now accepted—phrases to mean something else is bound to cause confusion. So, just like you learn what a "programming language" or "HyperText Transport Protocol" is (yes, one transfers a lot more than just "HyperText" over it), if you are in IT, one should learn what "Free Software" and "Open Source" mean.