RF, or Radio Frequency, refers to the range of electromagnetic frequencies that are used for wireless communication. This range of frequencies is typically between 3 kHz and 300 GHz. RF signals are used for a variety of applications, including radio and television broadcasting, cellular communication, satellite communication, and wireless networking.

RF signals are transmitted through the air using antennas, which convert electrical signals into electromagnetic waves that can travel through space. These waves can be received by other antennas and converted back into electrical signals, allowing for wireless communication.

RF technology has revolutionized the way we communicate and has enabled many of the wireless devices we use today. As technology continues to advance, the use of RF signals is likely to become even more widespread.