The World Bank (WBG) is commonly known as the World Bank Group, "World Bank" name has been used to refer to International Bank for Reconstruction (IBRD) and the International Development Association (IDA). These institutions to provide low-interest loans to developing countries combined, interest-free credits and grants. It is an international organization's mission is to help one start in World War II destroyed the country's reconstruction. Today it's mission is to support countries to overcome poverty, agencies in reducing poverty and raising living standards of the mission to play a unique role.
The World Bank [1] refers only to International Bank for Reconstruction (IBRD) and the International Development Association (IDA). "The World Bank Group" includes IBRD, IDA, and three other institutions, namely the International Finance Corporation, the Multilateral Investment Guarantee Agency and the International Center for Settlement of Investment Disputes. These five institutions are focused on different areas of development, but they all use their respective comparative advantages, working together to achieve their common ultimate goal, namely, poverty alleviation.