CPUs (Central Processing Units) are the brain of a computer, responsible for executing instructions and processing data. A CPU is integral to overall system performance, with faster processors capable of handling more demanding tasks such as gaming, video editing, and 3D rendering. CPUs come in various models, with differing core counts, clock speeds, and architecture types. Upgrading the CPU is a common way to boost a computer's performance. Online shopping for CPUs provides a wide selection of models from top manufacturers, including Intel and AMD, to suit different computing needs.