An engine is a machine designed to convert one form of energy into mechanical energy.
Alternatively referred to as compare, diff is short for different or difference and describes a program's ability to show the difference between two or more files. A diff can be an invaluable tool in programming as it enables a developer to see what has changed in-between versions.
A cylinder is the power unit of an engine; it's the chamber where the gasoline is burned and turned into power. Most cars and SUV engines have four, six, or eight cylinders. Generally, an engine with more cylinders produces more power, while an engine with fewer cylinders gets better fuel economy.
Open loop hydraulic system and closed loop hydraulic system are the two types of hydraulic system. In an open loop system, when the actuating mechanism is idle, there will be fluid flow but no pressure. For a closed loop system, when the pump operates there will be pressure for fluids.
A transmission is a machine in a power transmission system, which provides controlled application of the power. Often the term transmission refers simply to the gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device.