Hertz (Hz) measures frequency, the number of occurrences per second. Megahertz (MHz) represents millions of Hz. Frequency plays a crucial role in signal processing, radio waves, and telecommunications, influencing applications like filtering, navigation, and wireless networks. It affects bandwidth, essential for communication systems. From signal generators to antennas, equipment related to Hertz and frequency enables the functioning of technologies we rely on daily, with advancements promising further possibilities in the future.