Genghis Khan: He was the founder and first Great Khan (Emperor) of the Mongol Empire which became largest contiguous empire in history after his death.
Yuan Dynasty: This refers to dynasty in China ruled by successors of Genghis Khan. It was part of larger Mongol Empire but eventually became independent entity.
Silk Road: An ancient network of trade routes connecting East Asia with Middle East and Europe. Under Mongol rule, Silk Road experienced relative safety leading to increased trade between these regions.