Answer:
CPU.
Step-by-step explanation:
A processor, also known as a Central Processing Unit, is a piece of hardware in a computer that performs basic operations and control when executing program code.
Processors are usually made as integrated circuits closed in a hermetic casing, often with gold-plated leads (used for resistance to oxidation) and in this form they are called microprocessors - in common speech the terms processor and microprocessor are used interchangeably. The heart of the processor is a single crystal of silicon, on which a series of semiconductor layers have been applied by means of photolithography, forming, depending on the application, a network of several thousand to several billion transistors. Its circuits are made of metals with good electrical conductivity, such as aluminum and copper.