This document provides an overview of agriculture, including different types of farming. It discusses subsistence farming, which focuses on growing enough food for a farmer's family. Types of subsistence farming include shifting agriculture, nomadic herding, and intensive subsistence farming. Commercial farming is described as the large-scale production of crops for sale in distant markets. Types of commercial farming include intensive and extensive commercial farming as well as plantation agriculture. The document concludes by describing several major crops grown globally including maize, wheat, rice, millets, jute, cotton, coffee, and tea.