I'm following the Blockchain revolution for quite some time now. I even took a Princeton online course in the Spring of 2015, which I highly recommend, if you want to understand how it works at a technical level.
Every time someone asks me to explain why am I so excited about it, I would like to have some quick easy way of explaining it, or maybe some link to point to.
Today I've found the best, Explain Like I'm Five, Blockchain video, and I'm putting it here for convenience. Watch it, it only takes 10 minutes: