Variable magnification refers to the ability of an optical device, such as a telescope or microscope, to adjust its level of magnification. This feature allows users to zoom in or out, providing flexibility to observe objects at different scales. For instance, a telescope with variable magnification can help astronomers view celestial bodies in greater detail or at a wider field of view. This capability is achieved through the use of adjustable lenses or zoom mechanisms. Variable magnification enhances the user experience by allowing for detailed examination of subjects, whether they are distant stars or microscopic organisms, making it a valuable tool in both scientific research and recreational activities.