Answer:
Buddhism is an ancient religion based on the teachings of the Buddha (“Awakened One”)—the title given to the Indian spiritual seeker Siddhartha Gautama after he attained enlightenment more than 2,600 years ago. The Buddha’s best-known teachings, the four noble truths and the eightfold path, describe the nature of human suffering and a way to liberate oneself from the existential pains of life and reach nirvana.
These teachings spread from India throughout Asia and eventually the rest of the world. While the broader Buddhist family includes many different schools with their own beliefs and practices, these various traditions share a conviction that one can come to understand the truth of existence by living an ethical life dedicated to spiritual development.
Extra:
The basic doctrines of early Buddhism, which remain common to all Buddhism, include the four noble truths : existence is suffering ( dukhka ); suffering has a cause, namely craving and attachment ( trishna ); there is a cessation of suffering, which is nirvana ; and there is a path to the cessation of suffering, the Buddhism is the world's fourth-largest religion with over 520 million followers.