The spaceship or simply ship is a craft, wich usually contains more modules as cabin able to hold the crew. As a general use of the term, the term itself is widely used for any kind of spacecraft containing several modules. The game's system automatically sorts every kerbonaut driven vessel to the ships, except of those have lander- and rover-like command modules.
The ships are lifted to orbit by launch vehicles, and as general term the ship contains even its first stages too. The ship may contain interplanetary stage, landers, - even with rover, and probes for further exploration beyond the cabin (and returning unit) and the launch vessel.