Answer
The Ambani family's fortune, estimated at $83.4 billion as of February 2023, is largely attributed to the success of Reliance Industries Limited (RIL), a conglomerate with interests in various sectors including oil and gas, petrochemicals, retail, and telecommunications. Nita Ambani, wife of RIL chairman and largest shareholder Mukesh Ambani, plays a significant role in the company's growth and philanthropic initiatives, contributing to the family's prominence and wealth.