Gigahertz (GHz) is a unit of frequency that measures cycles per second, specifically one billion cycles. It is commonly used to describe the speed of computer processors, such as those found in laptops and smartphones. A higher gigahertz rating typically indicates a faster processor, which can lead to improved performance in tasks like gaming and multitasking. In addition to processors, gigahertz is also relevant in wireless communication, such as Wi-Fi and cellular networks. Different frequency bands, measured in gigahertz, can affect the range and speed of wireless signals, influencing how well devices connect to the internet and communicate with each other.