This article is the first (out of two) concerning Onion Routing. It is also the first of the Routing Series, where I'll try to cover in depth how routing works in the Lightning Network, and how it could work differently (ever heard this story about an ant jumping on a trampoline?). This article is an introduction to Onion Routing, and offers a "high level" view of how it works. The second article will go deeper into the inner workings of Onion Routing in the Lightning Network.