A loader may be a serious instrumentation machine employed in construction to maneuver aside or load materials like asphalt, demolition rubble, dirt, snow, feed, gravel, logs, raw minerals, recycled material, rock, sand, woodchips, etc. into or onto another kind of machinery (such as a dumper, conveyor, feed-hopper, or railroad car). There are many varieties of a loader, which, looking on style and application, are known as by numerous names, together with a bucket loader, front loader, front-end loader, payloader, scoop, shovel, skip loader, wheel loader, or skid-steer.

The largest loader within the world is LeTourneau L-2350. Currently, these giant loaders are in production within the Longview, American state facility. The L-2350 uses a diesel-electric locomotive system like that employed in a locomotive. every rubber tired wheel is driven by its own freelance motor.