This term appears in the “Understanding Society through Time and Traditions” section and is also given as a highlighted glossary box in the textbook. It reflects how early Indian thinkers tried to understand the natural world through observation and philosophical reasoning, long before modern science developed. The concept describes the world as made of five fundamental elements and is used even today to explain how environment shapes human settlement patterns, occupations, architecture, food habits, and health. When answering, mention both the five elements by name and their relevance to understanding nature as an interconnected system.