It is a common misconception that an alloy is only a blend of two metals. An alloy is a blend of metal and/or elements.
An alloy is a metal that has been combined with other substances in order to achieve specific desired properties. Example of these properties include to make it more malleable, harder or stronger.
To change the properties and capabilities of precious metals, pure metals gets mixed with other substances. This process is called alloy. If you have a pure metal, you have one kind of atom. If you add an alloy, you have two or more elements that are combined. THIS changes the properties of the metal.