Raspberry Pi3

The Raspberry Pi 3 is the third generation Raspberry Pi. It replaced the Raspberry Pi 2 Model B in February 2016. Compared to the Raspberry Pi 2 it has:

A 1.2GHz 64-bit quad-core ARMv8 CPU

802.11n Wireless LAN

Bluetooth 4.1

Bluetooth Low Energy (BLE)

Like the Pi 2, it also has:

1GB RAM

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. If you wish to embed their Pi in a project may prefer the Pi Zero which require very low power.

https://www.raspberrypi.org/products/raspberry-pi-3-model-b/