What makes one medium capable of greater data communication speed than another?

The data communication speed of a medium is influenced by factors such as bandwidth, signal attenuation, and the physical properties of the medium. For instance, fiber optic cables can transmit data at higher speeds than copper cables because they use light signals, which can carry more information over longer distances with less loss. Additionally, the medium's ability to support higher frequencies and the technology used for modulation and encoding also play critical roles in determining its speed capabilities. Ultimately, the combination of these factors allows certain mediums to achieve superior data communication speeds.