The term "frequency range" refers to the span of frequencies that a particular system, device, or signal can effectively operate within. It is commonly used in various fields, including audio engineering, telecommunications, and radio broadcasting. For example, a speaker may have a frequency range of 20 Hz to 20 kHz, meaning it can reproduce sounds within that spectrum. Frequency ranges are important because they determine how well a device can perform its intended function. In wireless communication, different frequency ranges are allocated for specific uses, such as cellular networks or Wi-Fi, to minimize interference and optimize performance.