The Deformers take an input mesh and alter the position of the vertices based on the particular method that the Deformer is using. For example, a TaperDeformer will bend the input mesh so that it grows thinner or wider along its height, depending on a deformation curve. As with other nodes in Archimatix, the Deformers are non-destructive, allowing you to change your mind as often as you like about the look of the deformation