This document explores Aristotle's fundamental conception of motion, which serves as a cornerstone of his natural philosophy. The primary focus is the distinction between the mover (the moving agent) and the moved (the object undergoing change). Aristotle asserts that in every instance of motion, it is necessary to differentiate these two components. A crucial element of this theory is the spatial and conceptual localization of the moving force, which can reside either outside the object being moved or within it. When the moving principle is internal, it is identified with the concept of energeia—representing actuality or the inherent activity through which things are set in motion by their own nature. The text further examines the implications of this ontological structure for understanding causality and teleology in ancient thought. By highlighting the relationship between the mover and the moved, the analysis clarifies how Aristotle explains the processes of change and development within the physical world.