In a distant future, when humans explore Space like we do Earth, one vehicle would be credited with giving us that power and it would be the SpaceX Falcon 9, the first and the only commercial vehicle capable of launching humans to orbit. And even when it has successors, they would trace their capabilities back to the Falcon 9 rocket. For eternity to come, this rocket will be special in human history and how we eventually conquered the universe. Until that time, the Falcon 9 will continue to fly and land over and over again, seeing more flights than any rocket before it. To understand this marvel of a machine, we must start with answering the simple question, what exactly is the Falcon 9?