Here's how it works: members can install an extra wifi router in their home and connect it to their internet connection. This then creates a separate and public wifi access point that allows people in the area to use the Internet. For a better understanding of what's behind the initiative, we spoke to Andre Schmidt who is part of Freifunk Hamburg.
To give you an insight into Freifunk's current reach in Germany, here is a map that @Freifunk shared through their twitter account.