Unlicensed bands refer to portions of the radio frequency spectrum that are available for use without requiring a specific license from a regulatory authority, such as the Federal Communications Commission (FCC) in the United States. These bands are typically open for anyone to use for various wireless communication applications, including Wi-Fi, Bluetooth, and other short-range devices. Research in unlicensed bands focuses on optimizing the utilization of these frequencies, improving performance, reducing interference, and developing new technologies to make better use of the available spectrum. This research is important for the development of wireless communication systems that rely on unlicensed bands for connectivity, as well as for ensuring that these bands remain accessible for innovation and growth in the field of wireless communication.