The word Hinduism derives from a Persian term denoting the inhabitants of the land beyond the Indus, a river in present-day Pakistan. By the early nineteenth century the term had entered popular English usage to describe the predominant religious traditions of South Asia, and it is now used by Hindus themselves. Hindu beliefs and practices are enormously diverse, varying over time and among individuals, communities, and regional areas. Unlike Buddhism, Jainism, or Sikhism, Hinduism has no historical founder. Its authority rests instead upon a large body of sacred texts that provide Hindus with rules governing rituals, worship, pilgrimage, and daily activities, among many other things.