Raspberry Pi Zero (Without wifi version) is a super cheap single board computer. The Raspberry Pi Zero is half the size of a Model A+, with twice the utility. A tiny Raspberry Pi that’s affordable enough for any project! Raspberry Pi Zero v1.3 Development Board is a super-compact, hackable, and ultra-low-cost computer, This is the latest version (V1.3) with camera connector (CSI 0.5mm pitch to pitch). As there is no so call clone version of this super low-cost computer, this is the original Raspberry Pi Zero from https://www.raspberrypi.org/
With BCM 2835 (32-bit ARM-based processor) SoC running at 1GHz, the raspberry pi zero is faster than Raspberry Pi 1. With Mini-HDMI, Micro-B OTG USB, and the same 40-pin GPIO it still has great connectivity although you’ll probably need some accessories to help you hook it up to your existing devices.
Yes, it is really attractive, but do bear in mind that you need additional accessories to get it running. At least Micro USB Power Supply Adapter And Micro SD Card is a must.