These are the pins for comunication. The middle pins on the bottom are CH_PD(chip power-down) and RST(reset). The main thing to remember is, that this device works with 3.3V;even the RX and TX pins. Arduino or many USB to serial converters work with 5V.

How do I connect to ESP8266?

To see if it works, open the Wi-Fi settings on your computer, look for a network called “ESP8266 Access Point”, enter the password “thereisnospoon”, and connect to it. Then open a terminal, and ping to 192.168. 4.1 (this is the default IP address of our ESP AP). You’ll see that the ESP responds to your pings.

Can ESP8266 work on 5V?

ESP8266 module is not 5V tolerant. It works on 3.3V power suplay. Most Arduinos works on 5V.