Final answer:
Siddhartha Gautama achieved enlightenment through a process of meditation and self-reflection.
Step-by-step explanation:
Siddhartha Gautama used a process of meditation and self-reflection to achieve enlightenment. At the age of thirty-five, he famously meditated under a sacred fig tree and vowed not to rise before he achieved enlightenment. Through his meditation practice, Siddhartha gained deep insight into the nature of suffering and the causes of suffering, and ultimately attained enlightenment and became known as the Buddha.