The technical term for the “brain” of a computer is the CPU, or central processing unit. It executes program instructions, performs calculations, and coordinates many of the operations that let software run.
A CPU contains key components such as the arithmetic logic unit, which handles calculations and comparisons, and the control unit, which directs the movement of instructions and data. Its speed is commonly discussed in gigahertz, although performance also depends on architecture, core count, memory, and software.
The CPU is not the same as storage or memory. RAM temporarily holds data that active programs need, while a hard drive or solid-state drive stores files long-term. Graphics processing units, or GPUs, are specialized processors designed especially for graphics and parallel workloads, but the CPU remains the computer’s general-purpose processing center.