A transmitter is a device that sends signals, often in the form of radio waves, to communicate information over distances. It converts electrical signals into electromagnetic waves, which can then travel through the air or other mediums. Transmitters are commonly used in various applications, including television, radio broadcasting, and cellular communication. Transmitters can vary in size and power, from small devices in smartphones to large towers used for broadcasting. They work in conjunction with receivers, which capture the transmitted signals and convert them back into usable information, such as sound or data. This technology is essential for modern communication systems.