What is the difference of unmanned and manned?

The terms "unmanned" and "manned" refer to whether a vehicle or system is operated by a human. "Manned" indicates that a human is present and actively controlling the operation, such as in a crewed aircraft or submarine. In contrast, "unmanned" refers to vehicles or systems that operate without human presence on board, relying on remote control or autonomous systems, like drones or robotic spacecraft. The distinction highlights the presence or absence of human operators in the operation of technology.