How did the world bank help the developing countries?

The World Bank can be considered the world's bank. Many governments (National and State) of various developing nations approach the world bank for monetary help with respect to various development project in their region. For ex: If the Chief Minister of the State of TamilNadu (India) plans on building a huge dam across one of its rivers and requires funding worth a few hundred crores of Rupees and does not have sufficient funding in his coffers, he can approach the world bank. He would have to submit a proposal with details of the plan along with details as to how he plans on repaying the borrowed money. If the World Bank feels that the plan will benefit the people of the state and also if they feel the state government will be able to repay the money loaned out, they will grant the loan.