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Shields are attachments that "snap" onto the Arduino board adding functionality. They are usually the same shape as an Uno/Leonardo/Duemilanove. Some examples are: the Ethernet (includes SD port) shield, motor shields, and sensor shields.

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It is retired so will I have any problem? It depends on what you want to do with your arduino. If you need a project that requires future support then dont buy a retired board. If you just want to do …
answered Aug 30 '16 by qwerty10