I presented in this book a lot of information about the essential feature of Hinduism. I focused more on the philosophy and spiritual aspects of Hinduism or what we call in Hinduism, the higher knowledge. I traced the antiquity of Hinduism to its earliest time based on the recent researches, apart from explaining the rationale behind the most popular practices such as idol worship. After reading this book you will be familiar with concepts such as karma, reincarnation, yoga, and Hindu philosophies.