Muhammad Yunus, a Bangladeshi social entrepreneur and Nobel Peace Prize laureate, founded the Grameen Bank to provide microcredit to the poor, enabling them to start businesses with minimal loans. He discovered that small loans could significantly improve the lives of impoverished individuals, particularly women, leading to the establishment of the Grameen Bank in 1983. His model of microfinance has inspired similar initiatives worldwide, impacting millions of borrowers and promoting economic and social development.