Like the Pi 2, it also has:

• 4 USB ports

• 40 GPIO pins

• Full HDMI port

• Ethernet port

• Combined 3.5mm audio jack and composite video

• Camera interface (CSI)

• Display interface (DSI)

• Micro SD card slot (now push-pull rather than push-push)

• VideoCore IV 3D graphics core

The Raspberry Pi 3 has an identical form factor to the previous Pi 2 (and Pi 1 Model B+) and has complete compatibility with Raspberry Pi 1 and 2.