ESP8266 is Wi-Fi enabled system on chip module developed by Espressif. It is used for development of IoT embedded applications. Wifi module
ARDUINO UNO WiFi REV2 — Arduino Official Store
esp-07 high resolution pinout and specs – Renzo Mischianti
Arduino Nano 33 IoT Pinout and Specification
ESP8266 - Wikipedia
Arduino Mega ADK Pinout & Specification
Sensors Modules Esp8266 Wifi Module
Sensors Modules Esp8266 Wifi Module
ESP12E - WiFi Module Pinout, Features & Datasheet
ESP8266 Pinout, Datasheet, Features & Applications - The Engineering Projects
ESP32: pinout, specs and Arduino IDE configuration – Part 1 – Renzo Mischianti
Configuration of ESP8266 WiFi Module. The ESP8266 WiFi module in this
Buy ESP-12E ESP8266 Wifi Module with cheap price
ESP12E - WiFi Module Pinout, Features & Datasheet