It refers to the speed of the processor. The clock speed is measured in terms of MegaHertz (millions of pulse per second) or Gigahertz (billions of pulses per second). The clock speed ranges from 1000 MHz to 3000 GHz. It means in 1000 MHz clock speed processor, can perform approximately 1000 million instructions per second. The faster the clock speed, the faster the processing speed.
Ex: 2.7 GHz processor, 3.0 GHz processor, etc,
