Define a hydraulic drive system.

A hydraulic drive system is defined as one that utilizes pressurized fluid to transmit power. This type of system harnesses the properties of hydraulic fluids, often oil, which are capable of exerting a large amount of force when pressurized. This force can be directed to perform work, such as lifting heavy loads or driving machinery.

The mechanism typically involves a pump that generates hydraulic pressure, which then moves fluid through hoses or pipelines to hydraulic cylinders or motors. This pressurized fluid empowers the hydraulic components to perform tasks such as lifting, pushing, or turning, which are essential in various applications, from construction equipment to manufacturing machinery.

The relevance of this answer lies in understanding that the effectiveness and strength of hydraulic systems come from their ability to transmit power through fluid, making them preferable in scenarios requiring significant force and precise control.