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The Raspberry Pi is a small single-board computer that was developed in the United Kingdom by the Raspberry Pi Foundation on February 29, 2012; the device was created to further influence and teach the basics of computer science in schools as well as developing countries. There has been seven different models created, since the demand and appeal for these miniature computers has spread a convenient means of learning the field of stem. This success made way for a broad range of products to be released and used jointly with the Raspberry Pi's, these products ranged from cases to cameras.

The foundation provides users with Raspbian, which is an Debian based Linux system for download, as well as the Ubuntu system, and Windows 10 IoT Core. The foundation promotes Python and Scratch as the main languages of use along side with other supporting languages. The primary firmware is closed source, however, the user can choose to utilize optional unofficial open source systems. This product also can operate on various other systems, these operating systems can also be accessed via the Raspberry Pi Foundation official website.

The foundation offers various opportunities to learn the in and outs of the product. Featured on the website is multiple forums on how to download, run, and trouble shooting. There are also multiple links to volunteer based tutorials and clubs. The website also features blogs to be viewed, these posts highlight meet ups in various locations, as well as competitions and guidebooks.

There are currently seven models on the market to date, each adding note worthy upgrades to aid in efficiency.

Raspberry Pi Zero is the first $5.00 computer, the Raspberry Pi Zero is the smallest form of Raspberry Pi available to consumers. It is 40% faster than the original Raspberry Pi despite being 65mm by 30mm wide and 5mm deep. The Raspberry Pi Zero supports mini connectors as a way to save space, and the 40pin GPIO is isolated providing the flexibility to use only the connections your project requires. The Raspberry Pi Zero also possesses a 1GHz processor and contains 512 megabytes of RAM, it also has ports for a mini HDMI cord as well as, USB ports.

Raspberry Pi Zero W is $10.00, the Raspberry Pi Zero is the smallest form of Raspberry Pi available to consumers now containing WIFI and Bluetooth connectivity features. It is 40% faster than the original Raspberry Pi despite being 65mm by 30mm wide and 5mm deep. The Raspberry Pi Zero W supports mini connectors as a way to save space, and the 40pin GPIO is isolated providing the flexibility to use only the connections your project requires. The Raspberry Pi Zero W also possesses a 1GHz processor and contains 512 megabytes of RAM, it also has ports for a mini HDMI cord as well as, USB ports.

The Raspberry Pi A+ model costs $25.00 on market. This model provides more GPIO pins, the GPIO header has grown to 40 pins, while still retaining the same pin out for the first 26 pins as the Model A and B. The old friction-fit SD card socket was replaced with a push Micro SD version. Lower power consumption. The replacement of linear regulators with switching ones in turn has caused the power consumption to be reduced between 0.5W and 1W. The audio circuit incorporates a dedicated low-noise power supply to provide better audio quality.

The Raspberry Pi B+ model is the second revision of the original Raspberry Pi costing $35.00. This model utilizes more GPIO pins, the GPIO header has grown to 40 pins, while still retaining the same pin out for the first 26 pins as the Model A and B. The old friction-fit SD card socket was replaced with a push Micro SD version. The B+ also has four USB 2.0 ports, and better overheating protection.The replacement of linear regulators with switching ones in turn has caused the power consumption to be reduced between 0.5W and 1W. The audio circuit incorporates a dedicated low-noise power supply to provide better audio quality.

Raspberry Pi 2 Model B costs $35.00. It replaced the original Raspberry Pi Model B+ in February 2015. It contains: 900MHz quad-core ARM Cortex-A7 CPU, 1GB RAM, 40 GPIO pins, full HDMI port ,Ethernet port, Combined 3.5mm audio jack and composite video, camera interface, display interface, Micro SD card slot, 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 IoT Core.

The Raspberry Pi 3 Model B costs $35.00 and has improved power management to support more powerful external USB devices, and now comes with built-in wireless and Bluetooth functions. The Raspberry Pi 3 B has: Broadcom BCM2837 64bit ARMv8 QUAD Core 64bit Processor powered Single Board, running speed of 1.2GHz, 1GB RAM, WiFi, Bluetooth Low Energy, 40pin extended GPIO, 4 x USB2 ports, 4 pole Stereo output and Composite video port,  full size HDMI, camera port for connecting the Raspberry Pi camera, display port for connecting the Raspberry Pi touch screen display, Micro SD, switching Micro USB power source.

The Raspberry Pi 3 Model B+ costs $35.00. The Raspberry Pi 3 Model B+ is the latest product in the Raspberry Pi 3 range, featuring a 64-bit quad core processor running at 1.4GHz the fastest running Raspberry Pi. The features include a dual-band 2.4GHz and 5GHz wireless LAN, Bluetooth 4.2 / Bluetooth Low Energy, faster Ethernet, and Power over Ethernet, and enhanced cooling features.

“Raspberry Pi.” Wikipedia, Wikimedia Foundation, 5 Nov. 2018, en.wikipedia.org/wiki/Raspberry_Pi.

Foundation, Raspberry Pi. “Raspberry Pi - Teach, Learn, and Make with Raspberry Pi.” ''Rotate Display 90º? - Raspberry Pi Forums'', www.raspberrypi.org/.