Construct is a creature type.
It is the general term for an Artifact Creature subtype used for artificial life-forms powered by mechanical means. As opposed to golems which are created through magic, typically with powerstones being used to provide them with energy. However, there is some degree of ambiguity between these terms in the game. Constructs are the Magic equivalent of a robot, a magically or mechanically animated device, usually with a pedal propulsion method. They come in a wide variety, but often imitate organic lifeforms.