Features
Electrolytic capacitor feature 1: The capacitance per unit volume is very large, tens to hundreds of times larger than other types of capacitance.
Electrolytic capacitor feature two: the rated capacity can be very large, and it can easily achieve tens of thousands of μf or even a few f (but not comparable to the electric double layer capacitance).

Electrolytic capacitor feature three: the price has an overwhelming advantage over other types, because the constituent materials of electrolytic capacitors are common industrial materials, such as aluminum and so on. The equipment for manufacturing aluminum electrolytic capacitors is also common industrial equipment, which can be mass-produced with relatively low cost.