Raspberry Pi Zero W is the Pi, but at a largely reduced size of only 65mm long by 30mm wide and at a very economical price. With the addition of wireless LAN and Bluetooth, the Raspberry Pi Zero W is ideal for making embedded Internet of Things (IoT) projects. The Pi Zero W has been designed to be as flexible and compact as possible with mini connectors and an unpopulated 40-pin GPIO.
The heart of the Raspberry Pi Zero W is a 1GHz BCM2835 single-core processor, the same as the B+ and A+, with 512MB RAM. Raspberry Pi Zero W is about four times faster than the original Raspberry Pi and is only a fraction of the cost of the current RPi3.
The setup for the Raspberry Pi Zero W is little more complicated than on other Pis. Because of the small size, many of the connectors on the Pi Zero are not standard.
Note: As of the release of the Raspberry Pi Zero W the NOOBS image will need to be updated to work on Pi Zero boards.
Features of Raspberry Pi Zero W:
802.11 b/g/n wireless LAN
Bluetooth Low Energy (BLE)
1GHz, single-core CPU
Mini HDMI and USB On-The-Go ports
Micro USB power
HAT-compatible 40-pin header pins
Composite video and reset headers
CSI camera connector
You can download the NOOBS software from the official Raspberry Pi website