A dielectric is a non-conducting material that, when subjected to an external electric field, becomes polarized. Polarization involves the internal molecular structures of the material responding to the field by separating positive and negative charges within its constituent atoms or molecules. This characteristic allows the dielectric material to store electrical energy and modify the capacitance of a system. In physical and electrical technology, dielectric materials are essential components, primarily utilized in the construction of capacitors, where they enhance the ability of the device to store charge. They are also critical for electrical insulation, preventing current leakage and ensuring the safe and efficient operation of high-voltage equipment and electronic circuits.