An HDMI extender is a device that allows you to transmit high-definition video and audio signals over longer distances than standard HDMI cables can support. Typically, HDMI cables are limited to about 50 feet, but extenders can extend this range up to several hundred feet using various technologies, such as Cat5e/Cat6 cables or fiber optics. These extenders are useful in settings like home theaters, conference rooms, or digital signage, where the source device (like a Blu-ray player or computer) is far from the display (like a TV or projector). By using an HDMI extender, you can maintain high-quality signal transmission without degradation.