Expansion shield to bring your Arduino board online with simple-yet-reliable communication libraries, supporting TCP and UDP protocols over an Ethernet cable.
Rich collection of examples: browse the Internet, make a tiny web server, and send data to a cloud with little coding effort.
Use its micro-SD card slot to store sensor information, serve files to 8 simultaneously connected devices, or log traffic.
Stackable : other shields can be stacked on top of it adding new functionalities to your projects.
No extra power needed, gets it from your Arduino board. It is true plug and play!