This book provides a comprehensive overview and insight of virtually all multilateral institutions involved in lending for international socio-economic development. The analysis covers twenty-five MDBs globally by classifying them in three groups based on geographical lending outreach. Unlike similar books and articles, which treat MDBs as banks, this book offers a novel perspective by addressing the specifics of multilateral lending institutions, revealing multiple aspects of their operations, going beyond the "bank" concept towards "knowledge bank," "change agent," and even "benchmark setter." The book reflects on the key role of most MDBs in inspiring and advancing sustainable economic development through transfer of knowledge and funding towards addressing multiple global challenges for the benefit of practitioners, consultants, government officials, borrowers, and researchers interested in MDBs.