The ESP8266 is a wonder WiFi module that can literally give any microcontroller access to WiFi network and thus enabling countless Internet of Things (IoT) and Home Automation applications at a fraction of cost compared to the alternative options. It's easy to use, it's popular, it has stormed the world of makers in recent years since 2014, you can now build your own cool electronic application that communicates to the internet and can be accessed from anywhere in the world