Dielectric Material: An insulating material placed between capacitor plates that increases its capacitance by reducing electric field strength.
Electric Field:A vector field around charged particles that represents forces exerted on other charges; in capacitors, it is created between two conductive plates.
Permittivity:$\epsilon_0$, also known as permittivity of free space, it quantifies how an electric field affects and is affected by a vacuum or dielectric medium.