The Council on Foreign Relations has a primer on China’s Belt and Road initiative here.

Xi’s vision included creating a vast network of railways, energy pipelines, highways, and streamlined border crossings, both westward—through the mountainous former Soviet republics—and southward, to Pakistan, India, and the rest of Southeast Asia. Such a network would expand the international use of Chinese currency, the renminbi, while new infrastructure could “break the bottleneck in Asian connectivity,” according to Xi. (The Asian Development Bank estimates that the region faces a yearly infrastructure financing shortfall of nearly $800 billion.) In addition to physical infrastructure, China plans to build fifty special economic zones, modeled after the Shenzhen Special Economic Zone, which China launched in 1980 during its economic reforms under leader Deng Xiaoping.

Xi subsequently announced plans for the 21st Century Maritime Silk Road at the 2013 summit of the Association of Southeast Asian Nations (ASEAN) in Indonesia. To accommodate expanding maritime trade traffic, China would invest in port development along the Indian Ocean, from Southeast Asia all the way to East Africa.