What is a cylinder for a car?

Question

like ive heard it alot lately. and i just wanna know what it is.

hahah i feel kindof stupid not knowing.

so if you could help that'd be great.[=

Answer 1

a cylinder is where the piston goes up and down in.

Answer 2

A cylinder is the tube in the engine in which the piston lives.  It is basically the heart of the engine, where the explosions happen that make an engine run.  There can be various numbers of cylinders in a car engine, but common variants are four, six, eight, ten and twelve.  Motorbikes tend to have one, two or four cylinders.