The property that describes a substance's ability to conduct electricity is known as electrical conductivity. Materials that readily allow the flow of electric current, such as metals, have high conductivity, while insulators like rubber have low conductivity. The conductivity of a substance depends on its atomic structure and the availability of free-moving electrons or ions. Conductivity can be influenced by factors like temperature, purity, and physical state, making it an essential property in various applications, from electrical wiring to electronic devices.