Buddhism is a religion based on the teachings of Siddhartha Gautama, who was born in the fifth century B.C. in what is now Nepal and northern India. He came to be called “the Buddha,” which means “awakened one,” after he experienced a profound realization of the nature of life, death, and existence. In English, the Buddha was said to be enlightened, although in Sanskrit it is “bodhi,” or “awakened.”
Barbara O’Brien, Learn Religions

Here is a list of websites which reference information on the basics of Buddhism and then some.