Final answer:
Gautama became known as Buddha, 'the enlightened one,' after meditating for 48 days under a tree, eventually establishing Buddhism and a monastic order.
Step-by-step explanation:
After sitting under a tree for 48 days, Gautama became Buddha, or the "enlightened one". Siddhartha Gautama, fondly known as Buddha, embarked on a profound spiritual journey abandoning a life of luxury to seek truth and enlightenment. At the age of thirty-five, he attained enlightenment (bodhi) after meditating under a sacred fig tree, thereafter renouncing his princely life and establishing a monastic order that shaped Buddhism. Drawing followers with his teachings, including the Four Noble Truths and the Eightfold Path, he provided a framework to attain liberation from suffering and the cycle of rebirth.