This document provides an introduction to income tax in India, including an overview of its introduction in 1961, definitions of key terms, and descriptions of the main heads of income. It notes that income tax is a direct tax paid by the same person who bears the burden. It also outlines several types of exempted incomes and explains the meaning of a Permanent Account Number. Finally, it describes the five main heads of income - salary, house property, business/profession, capital gains, and other sources - and provides a brief overview of each.