Megahertz is a measurement of frequency. One megahertz is equivalent to 1 million cycles per second, and it is written as MHz.
A megahertz is used to measure the speed of transmission in electronic devices such as computers, clocks and other equipment. This measurement can also be expressed in gigahertz, or GHz, which is equal to 1 billion cycles per second. Both megahertz and gigahertz are used to measure the CPU in a computer. The higher the megahertz or the gigahertz, the faster the computer will process and compute the information. Linguistically, both megahertz and gigahertz are German in origin.