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The Arduino Uno WIFI Board with ESP8266. The Arduino Uno Wi-Fi is the same as an Arduino Uno Rev3 but with an integrated Wi-Fi module! The board is based on the ATmega328P with an ESP8266 Wi-Fi Module integrated (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started.
The ESP8266 Wi-Fi Module is a self contained SoC with integrated TCP/IP protocol stack that can give access to your Wi-Fi network. (Or the device can act as an access point.) One useful feature of Uno Wi-Fi is support for OTA (over-the-air) programming, either for transfer of Arduino sketches or Wi-Fi firmware.

The datasheet of Arduino UNO WIFI is available here.
Arduino Uno Wi-Fi board will come pre-uploaded with the RestServer sketch that allows you to control the board via your web browser using the URL: http://192.168.240.1/arduino/<digital|analog>/<GPIO>/<ON_OFF|<INPUT_MODE>, where digital or analog let you select the IO type, GPIO the pin number, ON_OFF is either 1 or 0 for on or off, and INPUT_MODE is either input or output. Some examples:
1 × Arduino Uno WIFI Board with ESP8266