In economics class, we had to present a business plan. Mine was a coding summer camp for kids. I said the mission was "creating a generation of people who can work towards a bright future for the world." In the slide that lists aspects of supporting that mission, two items were "libre software" and "contributing" These were my verbal explanations:

Libre software: "...teaching the vision of a world without non-libre software and encouraging kids to work towards it by only making libre software, which means software that grants freedoms to users, such as seeing and changing the source code, so it is controlled by users instead of just companies..."

Contributing: "...and briefly introducing the process of creating and submitting contributions to code, which many libre software projects in the real world accept from anyone."

(Slideshow style is Steve Jobs + frutiger aero)