Some find and gather food. Some build and dig. Others take care of the young. Some eat leaves and stems from plants and trees. And some insects like to eat other insects.
Ants communicate through smells.
They use odors to warn their nest mates of danger and to lead them to food. Many insects communicate with sounds. Male field crickets chirp by rubbing their wings together to attract a female cricket. Wasps use poison stings to fight off predators. Other insects wear special armor.