WiFi
The ESP32 onboard the UNO R4 WiFi is used to give the board Wi-Fi® capabilities. The Wi-Fi® module has a bitrate of up to 150 Mbps. The ESP32 module has a built in trace-antenna, meaning you do not need an external one to use the connectivity features of the board. However, this trace antenna is shared with the Bluetooth® module, which means you cannot use Bluetooth® and Wi-Fi® at the same time.
To use the Wi-Fi® features of the UNO R4 WiFi, use the WiFiS3 library that is built in to the UNO R4 Board Package.