Open-source software (OSS) is computer software with its source code made available and licensed with a license
in which the copyright holder provides the rights to study, change and distribute the software to anyone and for any purpose.
Open-source software is very often developed in a public, collaborative manner.
Open-source software is the most prominent example of open-source development and often compared to
(technically defined) user-generated content or (legally defined) open-content movements.
to see this (latest) information on the Wikipedia site.
Two organisations exist to help promote the use of software that doesn´t tie up the user in "legal small print" (besides that, open-source software works fine and is free to our community)
A little effort is needed by those wanting to try out "open-source", after all, no commercial organisation wants you to find out that there are free substitutes for what they sell for a living, so these things are not widely promoted.
Ask a villager about the advantages, (unless you run a particular application that will only run on Microsoft™ OS) there are likely to be features you will find worthwhile. If you use it and like it - tell a friend, otherwise just pass the CD to someone else, they are free, test out your PC for compatibility without changing what is on your hard drive.
Save the bother of burning from .iso, get your certified CDs or Live DVDs via the webmaster or just download what you need !