Definition of Shield:
There are slabs that can be installed and developed on Arduino's circuits and boost their capabilities. Different shields follow the same Arduino Rule, which should be easy to install and easy to produce.
An open source platform platform based on easy use of hardware and software. Simply put, with Arduino's slices, you can design and programming very quickly, easily and inexpensively with Arduino's slices without having to learn basic programming and hardware.
A printed circuit board with a microcontroller (microprocessor) and its minimum requirements for programming and programming and input to inputs (such as sensors and keys, etc.) and outputs (such as drivers and displays, etc.)
A small computer with processor and memory and the ability to launch operating systems like Android or Linux and ...