What does the term $"$GHz$"$ mean?

Processor speed is measured in gigahertz, or GHz$,$ which refers to the number of machine cycles per second that the processor goes through. So$,$ for example, a $3C{H}_{Hz}Hz$ prossor performs $3$ billion machine cycles per second.

Processor speed is measured in gigahertz, or GHz$,$ which refers to the speed with which the CPU fetches data or instructions from RAM. So$,$ for example, a $3GHz$ processor performs $3$ billion program instructions per second.

Processor speed is measured in gigahertz, or $GHz,$ which refers to the speed with which the CPU can decode instructions into something the computer can understand. So$,$ for example, a $3GHz$ processor decodes $3$ billion program instructions per second.

Processor speed is measured in the number of programs in the system cycle. So$,$ for example, a $3GHz$ processor performs $3$ billion machine cycles per second.