Bees communicate within their hive primarily through the use of pheromones, which are chemical substances secreted by the bees. These pheromones play a crucial role in coordinating various activities within the hive, such as foraging, defending the hive, and selecting a new queen. Additionally, bees also use intricate body movements and vibrations, such as the famous waggle dance, to convey important information to other members of the hive. This complex system of communication helps bees work together efficiently as a highly organized colony.