Model Name	Raspberry Pi Zero	Raspberry Pi A+	Raspberry Pi B+	Raspberry Pi 2 Model B
Cost	$5	$20	$25	$35
Processor Speed	1GHz	700MHz	700MHz	900MHz
Power	microUSB	microUSB	microUSB	microUSB
USB Ports	Needs On-The-Go Adapter to convert 1 microUSB port to fullsize USB	1 Full Size USB port	4 USB ports	4 USB ports
Other Practical Ports	miniHDMI	HDMI	HDMI, Ethernet	HDMI, Ethernet
RAM	512MB	256MB	512MB	1GB
Who wants this?	Someone looking for a small chip (possibly to buy in mass quantity) and willing to cope with very few ports and having adapters dangling out of the board	Someone looking for a board with enough ports that has a very small power footprint	Someone looking for a working and stable board that runs Linux, can run most basic programs, and has many ports to work with	Someone looking to develop integrated device technology (for devices such as smart appliances) because this board can run Windows 10 for IOT (Internet of Things)
Image	Raspberry Pi Foundation	Raspberry Pi Foundation	Wikipedia	Raspberry Pi Foundation

Always remember, this is a board the size of a credit card. Do not expect it to run Fallout 4 or Adobe Photoshop. Do not buy the Pi 2 solely because it says "Windows." This is a special developer-only type of Windows 10. Be prepared to run a foreign operating system, Linux. Make an amazing project with your board and share it with the community.