This document discusses farming systems and related concepts. It begins by defining key terms like agriculture, farming, and farm. It then describes the attributes and typologies of farming systems, such as systems based on enterprise mix, dominant crops, agro-environment, use of inputs, and central/unique features. The document also discusses evolving system types, specialized systems, and protected cultivation systems. It provides examples to illustrate system interactions and hierarchies. Overall, the document provides an overview of concepts and frameworks for understanding farming systems.