A radio transmitter is a device that converts electrical signals into radio waves, allowing communication over distances. It generates a carrier wave at a specific frequency, which can be modulated with audio or data signals. This modulation enables the transmission of information, such as music or voice, through the air. Radio transmitters are essential components in various applications, including AM and FM radio broadcasting, television transmission, and two-way radios. They work in conjunction with antennas to send the radio waves, which can be received by compatible devices, such as radios and televisions, allowing people to access information and entertainment.