What is an Aluminum Electrolytic Capacitor, electrolytic capacitors, low esr

 EEE-FK Series 35 V 33 uF Ø 6.3 x 5.8 mm 105 °C Aluminum Electrolytic Capacitor

https://www.futureelectronics.com/p/passives--capacitors--aluminum-electrolytic-capacitors/eee-fk1v330p-panasonic-1028795