Central Processing Unit (CPU) - Navo

• The central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions. This phrase has been used in the computer industry at since the early 1960s
• The phrase "CPU" refers to a processor, more specifically to its processing unit and control unit (CU), distinguishing these core elements of a computer from external components such as main memory and I/O circuitry.
• The types of design and implementation of CPUs have changed over the course of their history, but their fundamental operation remains almost unchanged. Many of the Principal components of a CPU include the arithmetic logic unit (ALU) that performs arithmetic and logic operations,processor registers that supply operands to the ALU. Then it stores the results of ALU operations, and a control unit that fetches instructions from memory and "executes" them by directing the coordinated operations of the ALU, registers and other components.
• Many of the modern CPUs are microprocessors, meaning they are contained on a single integrated circuit (IC) chip. The IC, that contains a CPU may also contain memory, peripheral interfaces, and other components of a computer; such integrated devices are variously called microcontrollers or systems on a chip (SoC). A little amount of computers employ a multi-core processor, which is a single chip containing two or more CPUs called "cores"; in that context, single chips are sometimes referred to as "sockets". 
• The Array processors or vector processors have multiple processors that operate in parallel, with no unit considered central.