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The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. The baseline cost of the Raspberry Pi is between $5 and $35. It is popular with hobbyists and engineers because the Raspberry Pi has so many uses. It can be expanded with modules, like adding a camera module or a touchscreen module, to increase the scope of the device.The first commercially available Raspberry Pi unit was launched on February 19, 2012, and sales started ten days later. This version could run Linux-based desktop operating systems, and featured 256MB of RAM, one USB port, and no Ethernet port. This was named the Model A.[[File:Pi_Family_Zero_annotated_1500.jpg]]