The queen is the most important ant because it is the mother of all other. Once the nest is sufficiently developed, the queen remains in the deep galleries to spawn endlessly.

At birth, the queen has wings, it will lose after the nuptial flight. Otherwise, it looks like workers unless it is larger and may even turns fifteen

Generally, there is only one queen per colony, if it dies, the nest is doomed : No ants will born and workers will work until death