An Assembler, one of may buildings in Satisfactory.
A Building is a structure that an engineer can place using the Construction Tool. Buildings, like Vehicles, can be painted any color. Buildings can never be damaged, so require no upkeep. There are a total of 24 unique buildings not including Foundations, Vehicles, etc.
Different building tech will be unlock-able via multiple means, such as gaining access to new resources while exploring the world.
At least some buildings, such as the Constructor can be "overclocked" to specified percentages, allowing them to operate faster at the cost of increased power usage.