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Arduino UNO WiFi Developer Edition is an Arduino UNO R3 with ESP8266 integrated on the board. It was developed and manufactured by Arduino.org. Original documentation from arduino.org still exists in web archive.
ESP8266 is a 'WiFi chip' often used in combination with Arduino microcontrollers. Arduino UNO WiFi Developer Edition connects ATmega328 microcontroller to ESP8266 using additional on board UART chip SC16IS750. This additional UART - Serial1 is connected to Atmega as I2C device.
UnoWiFiDevEdSerial1 library creates a Serial1 object with SC16IS750 on Arduino UNO WiFi Developer Edition. This Serial1 enables to communicate with the on-board ESP8266 over it's serial interface. The included tool EspProxy enables accessing the on-board ESP8266 over USB for 'flashing' tools, IDE sketch upload or Serial Monitor.
