The Main Integrated Circuit Of A Computer System Consisting Of An Array Of Millions Of Integrated Circuits That Interfaces With Almost All Other Components And Runs Application And System Processes. Its Purpose Is To Accept Perform Calculations On And Eject Numeric Data. Its Considered The Brain Of The Computer Because Its The Part That Performs The Mathematical Operations Required For All Other Activity. Intel And Amd Are The Most Common Cpu Manufacturers For Personal Computers.