The amount of electrons a plate can store depends on the strength of the voltage source.
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.
The strength of the electric field is reduced due to the presence of dielectric.
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.