The first proper traction engine, in the form recognisable today, was developed in 1859 when British engineer Thomas Aveling modified a Clayton & Shuttleworth portable engine, which had to be hauled from job to job by horses, into a self-propelled one. The alteration was made by fitting a long driving chain between the crankshaft and the rear axle.
In 1892, John Froelich invented and built the first gasoline/petrol-powered Tractor in Clayton County, Iowa, US.
The most common use of the term "Tractor" is for the vehicles used on farms. The farm Tractor is used for pulling or pushing agricultural machinery or trailers, for plowing, tilling, disking, harrowing, planting, and similar tasks.