There are different categories of ants, each designed for different uses.
The most common are worker ants. They will care for the brood, and follow the player if given instructions to do so, but they have low health and attack.
They are characterized by being much bigger than the queen. One alone can cause great damage to a centipede, but will only survive around 4 bites. They are the slowest of all ants. About 1 in every 4 pupae destined to become a soldier will hatch as a supermajor.
The queen ant is the biggest ant of a colony, and therefore is the founder of it. Once a good spot has been chosen, the queen rarely moves, and when it does, it only does so by the instruction of the player. The queen main purpose is to lay eggs, therefore helping in the expansion of the colony. It is beneficial to keep the queen on wet dirt so that any eggs she lay will already be on an appropriate habitat.