The space station consists of at least two blocks. The first is the command block, and the last is the service block. Additional blocks can be installed in between.
The basic component of a ship is called a MODULE, and the basic component of a station is a BLOCK.
The station block often allows the installation of additional equipment. This is usually the reason why the block is built in the first place. Each block has a selection of predefined devices.
Some station blocks can be equipped with station weapons.