This document provides an overview of farm tractors. It discusses the requirements of tractors, how they have developed over time, and how they are classified. Tractors are classified by their type of construction (track, wheel, etc.), drive type, and purpose (utility, row crop, orchard, etc.). The document also lists major tractor assemblies and manufacturers in India, including models from Eicher, Escorts, GTCL, HMT, TAFE, Mahindra, Sonalika, PTL, Ford and New Holland.