Bitcoin is a decentralised digital currency which has been growing rapidly in popularity and use. You can send bitcoins to people and businesses around the world quickly, easily, and
with significantly less fees than international wire transfers, PayPal, or credit cards. You can even buy beer almost instantly; Here is a photo of me buying beer using Bitcoin.
If you’re developing a Bitcoin application, or even want to just play around with it, you can do so without costing anything and use a minimal amount of system resources. This blog post covers some technical topics about the Bitcoin block chain, which you might want to read up on the subject beforehand.