Dense Mode is a multicast routing protocol used in computer networks to efficiently manage data transmission. It operates by sending data only to network segments where there are active receivers, minimizing unnecessary traffic. This mode is particularly useful in scenarios where many receivers are clustered in a small area. In Dense Mode, the network initially floods the data to all segments, then prunes back the branches where no receivers are present. This approach helps conserve bandwidth and reduces congestion. It is commonly associated with protocols like Protocol Independent Multicast (PIM) and is ideal for applications with high receiver density.