Electroplating: A method of plating two materials together by process of hydrolysis.
Electroless plating: A process used to deposit nickel, gold, or silver in the form of a thin layer onto a solid piece of work. This method depends on the presence of a reducing agent. Hydrated sodium hypophosphite is an example of this.
Triple / alloy plating (copper / nickel / chrome)
Educate yourself on the different styles of plating