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Torque is a measure of twisting power, and is used to calculate horsepower. Torque is typically (especially when referring to torque levels in vehicles and engines) measured in foot-pounds, which is a measurement of the amount of force applied over the distance of a foot.

Engines that don't run at a high RPM tend to have a higher torque number than horsepower, and since trucks and other heavy-work vehicles have low-RPM engines, they are usually marketed with torque numbers rather than horsepower.

Introduction to Torque by Khan Academy