This video illustrates the “Hello World” exercise with the Arduino Ethernet Shield mounted as a Hardware Accessory on Top (HAT) of Arduino UNO board. The documentation from the Arduino web site as noted in the References section below provides detailed information on the HAT. Changes in operations and code by the author are solely for self-study purposes. This exercise demonstrates a single web request/response using HTTP. The request is directed to the DuckDuckGo search engine for the keyword Arduino Ethernet Shield. This exercise uses the Arduino UNO R3 board to host the Arduino Ethernet Shield R2 HAT with direct pin-to-pin connection. This limited exercise does not require supplementary sensors or components for the basic HTTP operations. Of course, access to the Internet is a prerequisite for the HTTP communication with an external web server.