Joomla is a wide world. It encompasses everything from great software to huge popularity and from community events to open source values.
Claes Norin and his team from http://www.joomlaproffs.se have done a wonderful job in explaining Joomla in just two minutes.
This video was debuted at JandBeyond in Germany this year.
You're welcome to use the video for your sites and for your marketing of Joomla. Just click Share in the top-right of the video to use it wherever you wish.
This is one of many great videos available on Joomla's YouTube channel.