The Asian Infrastructure Investment Bank (AIIB) is a multilateral development bank that aims to promote economic development and infrastructure projects in the Asia-Pacific region. It was officially established in December 2015 and began operations in January 2016. The AIIB is headquartered in Beijing, China.

Key features and aspects of the Asian Infrastructure Investment Bank include:

1. **Membership:** The AIIB’s membership consists of countries from various regions, both within and outside Asia. As of my last knowledge update in January 2022, the AIIB has 103 approved members, including many Asian countries, as well as European and other non-Asian countries. The bank’s governance structure includes a Board of Governors, Board of Directors, and President.

2. **Founding Principles:** The AIIB operates based on the principles of openness, transparency, independence, and accountability. It aims to foster sustainable economic development by investing in infrastructure projects that contribute to regional connectivity and poverty reduction.

3. **Infrastructure Focus:** The primary focus of the AIIB is on financing infrastructure projects in sectors such as transportation, energy, telecommunications, and urban development. By providing financial support to such projects, the AIIB aims to address the infrastructure gap in the region and promote inclusive economic growth.

4. **Project Financing:** The AIIB provides loans and other forms of financial assistance to support infrastructure projects. These projects are expected to adhere to environmental and social sustainability standards, and the AIIB emphasizes cooperation with other development institutions.

5. **Governance:** The governance structure of the AIIB includes a Board of Governors, which consists of representatives from member countries, and a Board of Directors, which oversees the day-to-day operations. The President of the AIIB is responsible for the overall management of the bank.

6. **Collaboration:** The AIIB collaborates with other multilateral development banks, financial institutions, and the private sector to mobilize resources and expertise. It aims to complement the efforts of existing institutions in the development finance landscape.

7. **Sustainable Development Goals (SDGs):** The AIIB aligns its activities with the United Nations Sustainable Development Goals (SDGs) to contribute to the achievement of targets related to poverty reduction, sustainable infrastructure, and economic development.

8. **Membership Expansion:** The AIIB has seen a steady increase in its membership since its establishment, reflecting the interest of countries in the region and beyond in participating in its initiatives.

The establishment of the AIIB marked China’s efforts to play a more active role in international development finance. The bank operates independently and collaborates with various stakeholders to address the infrastructure needs of the Asia-Pacific region. Its establishment has also been seen as part of the broader landscape of global development finance institutions.