GHz is a unit of measurement used to quantify the frequency of electromagnetic waves. It is commonly used to express the processing speed of computer processors and other electronic devices. Some synonyms for GHz include gigacycle, gigahertz, and billion hertz. These terms are interchangeable and can be used to describe the same thing. Other synonyms for GHz include frequency and clock rate, which can also refer to the same measurement. Regardless of the term used, GHz remains an important metric for understanding the performance capabilities of electronic devices.