“A few minutes into the flight, the Falcon’s second stage is set up to separate and continue the trek to orbit. The first stage, meanwhile, will be commanded to relight its rocket engines and slow its descent toward the Atlantic Ocean. If everything works properly, the launch vehicle will unfold a set of four landing legs, practice a landing maneuver — and then settle down into the sea gently enough to be recovered and reused.”

via SpaceX Aims to Blaze New Trail for Rocket Technology – NBC News.com.