The Raspberry Pi is a series of small, affordable single-board computers developed by the Raspberry Pi Foundation to promote computer science education and experimentation.
It is roughly the size of a credit card, making it highly portable.
Despite its size, it functions as a complete computer: it can run operating systems like Linux, supports programming, networking, multimedia, and even robotics projects.
It was specifically designed to provide low-cost computing to schools and hobbyists, enabling widespread innovation in electronics, IoT, and DIY projects.
Thus, the correct description is a {credit card sized computer}, not a dessert, swiping machine, or anything else.
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\boxed{\text{Raspberry Pi = Credit card sized computer}}
\]