The Arduino Prototyping Shield makes it easy for you to design custom circuits. You can solder parts to the prototyping area to create your project,or use it with a small solderless breadboard to quickly test circuit ideas without having to solder. It's has connections for all of the Arduino MEGA I/O pins, and space to mount through-hole and surface mount integrated circuits. It's a convenient way to make your custom Arduino circuit into a single module.