State Bank of India (SBI) is India’s largest public sector bank and one of the oldest financial institutions globally. Established in 1806 as the Bank of Calcutta, it was later renamed the Bank of Bengal and subsequently merged with the Bank of Bombay and the Bank of Madras in 1921 to form the Imperial Bank of India. In 1955, the Government of India acquired the Imperial Bank, renaming it the State Bank of India