Teleological means describing events as happening for purposes, for example, the sun shines in order to keep the Earth warm; the non-teleological version would be that the sun shines because of the process of nuclear fusion that takes place inside it. Or, a teleological explanation for why the rain falls, is to help the crops to grow. Non-teleologically, the rain falls because changes in air temperature will eventually cause water vapor to condense into droplets which at some point will become too large to remain suspended in the air, and which will fall due to the force of gravity. I could say that chemical reactions are driven by the desire of atoms to have eight electrons in their outer shell, which is teleological, but I could also say non-teleologically that an atom with eight electrons in its outer shell has a stable arragnement of electrons. See how that works?