“The core of a computer is referred to as:”

"The Central Processing Unit (CPU) often called the computer’s brain is responsible for executing instructions by performing fetch decode and execute operations. It processes data manages calculations and coordinates tasks within a computer system. As the primary component of hardware the CPU’s performance measured in clock speed and cores determines a system’s efficiency. Found in devices from smartphones to supercomputers the CPU is integral to computing technology driving advancements in software execution artificial intelligence and data processing in modern digital environments."