Shields

Shields are PCBs you can easily stack on development boards. The application circuits populated on shields add extra functionality to easily prototype a project. In general, these are called "daughter boards." The terminology and layout depends on the environment platform and form factor. Shields for Arduino typically use the Arduino Uno R3 footprint. However, shields can have a different layout depending on the architecture. Stackable PCBs for the Raspberry Pi are referred to as HATs or pHATs while the BeagleBone refers to them as Capes. Check out our tutorial about shields for more information.