English is the official language of the World Bank, as determined by its Articles of Agreement.

The World Bank uses more than three languages in its investment operations to ensure that information is accessible to people from different linguistic backgrounds.

English is the most commonly used language in World Bank investment operations due to its widespread use as a global language.

French is the second most commonly used language in World Bank investment operations due to its historical and cultural ties to many countries where the Bank operates.

Spanish is the third most commonly used language in World Bank investment operations due to its widespread use in Latin America and the Caribbean.

Arabic is the fourth most commonly used language in World Bank investment operations due to its use in the Middle East and North Africa.

Chinese is the fifth most commonly used language in World Bank investment operations due to its growing economic importance and its use in East Asia.

Russian is the sixth most commonly used language in World Bank investment operations due to its historical and cultural ties to many countries in Eastern Europe and Central Asia.

Portuguese is the seventh most commonly used language in World Bank investment operations due to its use in Brazil and other Portuguese-speaking countries.

Hindi is the eighth most commonly used language in World Bank investment operations due to its use in India, the world's second most populous country.

Japanese is the ninth most commonly used language in World Bank investment operations due to its economic importance and its use in East Asia.

German is the tenth most commonly used language in World Bank investment operations due to its economic importance and its use in Europe.

The World Bank uses multiple languages in its investment operations to ensure that information is accessible to people from different linguistic backgrounds, to promote cultural diversity, and to increase the efficiency of its operations.

The World Bank ensures that information is accessible to people from different linguistic backgrounds by translating documents into multiple languages, providing interpretation services, and hiring multilingual staff.

The World Bank faces a number of challenges in using multiple languages in its investment operations, including the cost of translation and interpretation, the difficulty of finding qualified multilingual staff, and the need to maintain consistency across different languages.