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A shield is essentially a "daughterboard" of a PCB that has pins to match the female pin headers on a standard format Arduino board. You build your circuits/connections of sensors (switches, light, sound, temperature sensors, etc.) and outputs (LED's, displays, etc.) on a shield as an efficient way to mate the inputs/output connections to an Arduino board. A shield is not required but is highly advised as a way to insure solid connections and organization of connections. For more information see:

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Q: What is a shield for Arduino and do I have to buy it if I already had an Arduino board?
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