Raspberry Pi:credit card-sized single-board computer

The Raspberry Pi is a credit card-sized single-board computer developed in the UK by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools.
The Raspberry Pi is manufactured in three board configurations through licensed manufacturing agreements with Newark element14 (Premier Farnell), RS Components and Egoman. These companies sell the Raspberry Pi online. Egoman produces a version for distribution solely in China and Taiwan, which can be distinguished from other Pis by their red coloring and lack of FCC/CE marks. The hardware is the same across all manufacturers.

In 2014 the Raspberry Pi Foundation launched the Compute Module, which packages a Raspberry Pi Model B into a SODIMM 200-pin module, to encourage its use in embedded systems.The below picture is the design of Raspberry Pi

The Raspberry Pi is based on the Broadcom BCM2835 system on a chip (SoC), which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and was originally shipped with 256 megabytes of RAM, later upgraded (Model B & Model B+) to 512 MB. The system has Secure Digital (SD) or MicroSD (Model B+) sockets for boot media and persistent storage.

Operating system:Linux (Raspbian, Debian GNU/Linux, OpenELEC, Fedora, Arch Linux ARM, Gentoo), RISC OS, FreeBSD, NetBSD, Plan 9, Inferno, Openwrt
Power:2.5 W (model A), 3.5 W (model B) 3.0 W (model B+)
CPU:ARM1176JZF-S (ARMv6k) 700 MHz
Memory:256 MB (Model A),256 MB (Model B rev 1),512 MB (Model B rev 2, B+)
Storage:SD card slot ,SD or SDHC card (Model A and B), MicroSD card (Model B+)
Graphics: Broadcom VideoCore IV