The merger of HDFC Bank and Centurion Bank of Punjab in 2008 created the 7th largest bank in India. It strengthened HDFC Bank's distribution network and product portfolio. In the initial years, HDFC Bank saw improved margins and returns due to economies of scale. However, integration challenges such as technology and HR issues posed difficulties. Over time, as integration was completed, the merged entity saw continued growth in profits and returns. The merger positioned HDFC Bank for greater growth opportunities in retail banking.