# Central Processing Unit The CPU is the general-purpose "brain" of a computer: it fetches instructions from a program, executes them one stream at a time (across a handful of parallel "cores"), and coordinates the rest of the machine. It is optimized for *flexibility* — running any kind of software, making complex decisions quickly — rather than raw parallel throughput. For decades the CPU was the chip that mattered, and the industry was defined by [[Intel Corporation]]'s dominance of the PC and server market. ## Why it matters here The CPU's relevance to the vault is mostly as the foil to the [[Graphics Processing Unit]]. The AI boom shifted the center of gravity in computing away from the general-purpose CPU toward the massively parallel GPU, which is far better suited to the math behind neural networks. That shift is why [[NVIDIA]] (a GPU maker) eclipsed [[Intel Corporation]] (the classic CPU giant) in market value, and why "compute" in the [[AI Arms Race]] and [[Chip Export Controls]] almost always means GPUs, not CPUs. Knowing the difference is the difference between understanding and not understanding the strategic chip story. ## See Also - [[Graphics Processing Unit]] — the parallel processor that displaced the CPU at the center of the AI race - [[System on a Chip]] — where the CPU now usually lives, alongside other blocks - [[Semiconductor]] — the chip the CPU is built on