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CPUs, or Central Processing Units, are the electronic brains of computers and other devices. They execute instructions, perform calculations, and manage data, serving as the primary workhorse of any system they're installed in. CPUs come in a variety of forms and configurations, from simple single-core designs to complex multi-core systems capable of handling multiple tasks simultaneously. At their core, CPUs are composed of transistors, which act as switches that turn on and off to process data. These transistors can be arranged in various ways to create different architectures, each with its own strengths and weaknesses. Some CPUs may focus on raw performance, while others prioritize power efficiency or other factors. Overall, CPUs are a critical component in any electronic device that requires processing power, from smartphones to supercomputers.