The money you’ve been using all your life is backed by a government of some sort, and it exists in a tangible way. Bitcoin is neither tangible nor backed by anyone, but it’s still worth a great deal to some people. This digital currency began circulating on the internet in 2009 with each Bitcoin worth just a tiny bit of “real” money, but right now a single Bitcoin is worth more than $2,000. Bitcoin is fascinating from a technological standpoint, but it’s also fueling online crime and violence because of the anonymity it offers. Here’s how Bitcoin works and why you should care.