An online activity in which you can turn your trash into someone else's treasure or vice versa via the Internet. Certain Web sites offer the ability for people to give (and get) stuff for free, the only rule is that no money can change hands. It works like this: Donors list items they have available giving their e-mail address. Visitors browsing the site then contact a donor via email and the two interested parties make private arrangements for the exchange. A win-win for all! It grew from a conservation-minded outreach intended to relieve pressure on landfills and protect the environment by encouraging people to recycle.