Arduino Uno Rev3 Vs. R4 WiFi: What's The Difference Between These Computers?
Arduino Uno R4 WiFi comes with built-in Wi-Fi and Bluetooth capabilities, along with additional pins and a new, faster processor.
Denizce Shutterstock Arduino Uno Huseyinekiz Shutterstock Wifi Arduino Uno Gogaspb Shutterstock Sorapop Udomsri Shutterstock
Source: slashgear.com