What is SpaceX's secret Zuma mission about?

Watch SpaceX launch its Falcon 9 rocket from Kennedy Space Center with a Korean communications satellite and land the first stage on the Of Course I Still Love You drone ship. A SpaceX Falcon 9 rocket carrying the U.S. government's secret Zuma mission stands vertical on Kennedy Space Center's launch pad 39A. The rocket launch was delayed Thursday, Nov. 16, 2017. CAPE CANAVERAL -- Could a secret U.S. government spacecraft be bound for a rendezvous with a spy satellite or even the International Space Station? Little is known about the mission called Zuma, targeting a launch as early as 8 p.m. Friday, the opening of a two-hour window, from Kennedy Space Center aboard a SpaceX Falcon 9 rocket.