With this Ethernet Shield and UNO board, you can connect to internet.
Can be used as server or client.
Directly plug puzzle board, no soldering required.
It is directly supported by Arduino official Ethernet Library.
It adds a micro-SD card slot, which can be used to store files for serving over the network.

Technical Details

Size (LWH): 5.3 inches, 3.2 inches, 0.8 inches
Product Details
Product Dimensions: 5.3 x 3.2 x 0.8 inches
Shipping Weight: 0.15 pounds (View shipping rates and policies)
ASIN : B00JB2Z74W