Hertz measures the frequency of cycles per second; gigahertz measures it in the billions range. So, one gigahertz or (GHz) equals one billion hertz, or one thousand megahertz (MHz).
People usually encounter the term gigahertz, or GHz when buying gadgets. In fact, any computer geek will go into a detailed examination of GHz, in terms of the clock speed of the CPU (computer processing unit). The GHz measures how fast the CPU can process information, and is an overall indication of the computer’s power. The lower the GHz, the slower it will be—programs will take forever to load, and some refuse to run completely. The first computers to reach 1 GHz sped were released in 2000, under Intel and Advanced Micro devices. Today’s computers run at the stunning capacity of 4 GHz.
GHz is also used in the radio communications industry to measure radio frequencies, or specifically, the band of the electromagnetic spectrum, which is indicated by a one-letter code. For example, S-Band runs between 2 and 4 GHz.
The L-band runs between 1 and 2 GHz.
Many devices, like WiFi and Bluetooth run on the S-Band. The L-Band, on the other hand, is used by GPS or global positioning systems.
It is important to take note of the GHz when using two electronic devices at the same time. If they operate within the same “band” they can compete with each other, because the waves of each frequency cancel out the other. For example, microwave ovens have been observed to disrupt Internet connections, due to the similarity of the frequency between the appliance and WiFi routers. This also happens between Bluetooth and WiFi.