Elektra - as an analogy, Poser figures are like sculptures. Those are the ones you export as OBJ (or 3DS, or whatever). They can be brought into other "sculpting workshops", or 3D apps, and be used as parts of scenes to be rendered. Rendering is like taking a photograph of the "sculptures" and other elements in a scene. Those are the ones you export as BMP, TIFF, JPG etc. When you do animation, you "film" a "moving scene", and export/save as MOV, AVI or other moving pic format.