An alloy is a substance formed from the combination of two or more metals. Alloys can also be formed from combinations of metals and other elements. In simpler words, an alloy can be defined as a homogeneous mixture of two or more metals or a metal and a nonmetal.
Some commercially valuable alloys are Steel, Nichrome, Bronze, Brass, Duralumin, Solder
German silver, a term for various copper, zinc, and nickel alloys, often even containing lead and tin.
The usual formulation of German silver is 60% copper, 20% nickel and 20% zinc. It is also named as Nickel silver due to its silvery appearance, but it contains no elemental silver unless plated.