Vibranium is a powerfully strong metal.
Vibranium is a rare alloy and was subsequently use for military usage. In the 1940s, the ultra-resilient alloy was used to create Captain America's shield.
A deposit of Vibranium is located in the African nation of Wakanda and become highly sought from governments abroad. Wakandan King T'Challa, rather than seeing the material abuse for ill cause, protected the deposit and occasionally selling off minute quantities of the metal. Because of this, Wakanda is one of the world's most technologically advanced nations.