please help I will mark Brainliest so watching a Bill Nye video and I'm not understanding this question

((What fluid is used to change the pressure in cars that raise and lower due to a hydraulic pressure lift?))
https://www.yout.ube.com/watch?v=VDGZGGlc5Tg&t=509s
take off the dot between you and tube
( the part of the question start in min 6:00)