The charge on capacitor plates is directly proportional to - Plate Capacitor: Voltage, Capacitance and Eletric Force

The capacitance of the capacitor is directly proportional to the surface area of the plates, which means the larger the surface area of the plate of the capacitor larger the value of capacitance, Also greater the value of permittivity, greater is the value of capacitance but the value of capacitance is inversely proportional to the distance between the parallel plate of the capacitor, that means smaller the distance between the plates of the capacitor greater will the value of the capacitance.

Capacitor is one of the most important.

Here we assume that between the plates there is a vacuum or at least only air.

A dielectric material with a high dielectric constant is a better insulator compare to a dielectric material with a lower dielectric constant.