ESP8266 is a highly integrated chip that has Integrated TCP/IP protocol stack. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
The adapter has a 2x4 female header to receive the ESP-01 module and provides easy access to those pins through two single row male headers (with clear pin names printed next to them) that are breadboard friendly. An additional power supply filter capacitor of 10uF is also provided on board.
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Review by Jonathan la Cour
The adapter is very handy if you're annoyed by the breadboard-unfriendly pin layout of the ESP8266. Both the ESP8266 and the adapter are of good quality. (Posted on 3/4/2015)