The earliest known metal castings date back to around 3000BC and were typically made of copper for weapons and religious idols. Casting originated in the Middle East and India using clay molds. During World War 2, investment casting became important for producing precision metal parts for military needs. It has since expanded into commercial applications. Around 1100AD, the lost wax method was documented and advanced casting techniques. Today, casting is used to create complex precision parts for applications like aerospace through advanced computer technologies.