The Raspberry Pi 2 Model B is the second generation Raspberry Pi. It replaced the original Raspberry Pi 1 Model B+ in February 2015. Compared to the Raspberry Pi 1 it has:
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A 900MHz quad-core ARM Cortex-A7 CPU
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1GB RAM
Like the (Pi 1) Model B+, it also has:
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4 USB ports
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40 GPIO pins
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Full HDMI port
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Ethernet port
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Combined 3.5mm audio jack and composite video
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Camera interface (CSI)
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Display interface (DSI)
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Micro SD card slot
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VideoCore IV 3D graphics core
Because it has an ARMv7 processor, it can run the full range of ARM GNU/Linux distributions, including Snappy Ubuntu Core, as well as Microsoft Windows 10 (see the blog for more information).
The Raspberry Pi 2 has an identical form factor to the previous (Pi 1) Model B+ and has complete compatibility with Raspberry Pi 1.