Ancient Indian thinkers made significant contributions to philosophy, science, and mathematics. Notable figures include Gautama Buddha, who founded Buddhism, and Adi Shankaracharya, known for his work in Advaita Vedanta. Their ideas explored concepts of reality, ethics, and the nature of the self, influencing millions. In addition to philosophy, thinkers like Aryabhata and Brahmagupta advanced mathematics and astronomy. Aryabhata introduced the concept of zero and calculated the value of pi, while Brahmagupta developed rules for arithmetic and algebra. These contributions laid the groundwork for future scientific developments in India and beyond.