The shield provides a simple solution for a universal I/O (input/output) for the Arduino boards, including the Uno, Leonardo, and Mega2560. It features many useful subsections, including 7-segment displays, pushbuttons, LEDs, and more.
Multifunctional Expansion Board Kit Based Learning Shield Multi-functional for Arduino Learning APC220 Bluetooth Voice Recognition Module Multi-function Shield has the
Great for temporary things you don't want to solder.
It provides a nice platform for wiring circuits to an Nano. It can be used in conjunction with or in place of a breadboard.