Raspberry Pi is a single-board computer developed by the Raspberry Pi Foundation in the UK.
The credit-card sized family of low-cost computer boards are mostly used by developers to build DIY IoT projects.
The Raspberry Pi Foundation is a UK charity that wants to promote computer science studies up and down the country and in developing economies.
As of February 2016, the foundation had sold over eight million boards, making Raspberry Pi the most sold PC in the UK.
To date, the organisation has launched four credit card-sized boards. The firmware on all of them is closed-source. All three generations of Raspberry Pi also feature a Broadcom system on a chip, which includes an ARM compatible CPU and a graphics processing unit.
The first board was released in February 2012, at a cost of $25. The Raspberry Pi 1 is compatible with different OSs including Linux, RISC OS, FreeBSD, NetBSD, Plan 9, Inferno and AROS.
Its CPU runs at 700 MHz and internal memory is 256 MB for models A, A+ rev 1 and B rev 1. Versions A+ rev 2, B rev 2 and B+ CM have 512 MB of internal memory. Extra storage can be added through a SDHC slot (models A+ and B+), a MicroSDHC slot (A+ and B+), and a 4 GB eMMC IC chip (model CM only).