A signal booster is a device designed to enhance the strength of a weak cellular signal. It works by capturing the existing signal from a nearby cell tower, amplifying it, and then rebroadcasting the improved signal within a specific area. This can help improve call quality and data speeds in locations where the cellular reception is poor. Signal boosters are commonly used in homes, offices, and vehicles to ensure better connectivity. They consist of three main components: an external antenna that receives the signal, an amplifier that boosts the signal, and an internal antenna that distributes the enhanced signal throughout the space.