Citizens Band radios, often referred to as CB radios, are short-range communication devices that allow users to talk to one another over radio frequencies. They operate on 40 designated channels within the 27 MHz band and are commonly used by truck drivers, hobbyists, and outdoor enthusiasts for real-time communication. CB radios do not require a license to operate, making them accessible to the general public. They are popular for their simplicity and effectiveness in areas where cell phone coverage may be limited, providing a reliable means of communication during travel or emergencies.