Cylinders come in different sizes and types. However, all cylinders have the same function. Namely, it is a driving element that exerts linear force by means of a hydraulic fluid. Thereby, a hydraulic cylinder consists of a 'housing', in which a piston with a piston rod fits.
A hydraulic cylinder allows the oil to be pumped under not too high pressure on one side of the cylinder. As a result, the piston rod will move at the same rhythm, allowing it to transmit a large force. At the same time, the fluid will be discharged. Thus, a cylinder can 'push' and 'pull'.