Hymenopterans reflect the harmony in nature, which is based on the concept of dual purposes, whereby an organism seeks its own individual purpose (survival, reproduction, development, maintenance) and yet provides values to the ecosystem and to others. For example, almost all bees are obligately dependent on flowers, in order to receive pollen and nectar, and the flowering plants are dependent on the bees for pollination. This is a classic example of dual purposes, one where both bees and the plants provide benefit to each other while receiving benefit.
Hymenopterans also are very important to human beings. Bees are the major type of pollinators in ecosystems that contain flowering plants, and as such are extremely important as pollinators in agriculture. It is estimated that one third of the human food supply depends on insect pollination, most of this accomplished by bees. In addition, honeybees are important for production of honey, and beeswax is used commercially to produce many products, such as candles. Many hymenopterans also are important becasue they are parasitic or predatory on other arthropods and are thus useful for controlling agricultural pests. Some hymenopterans (such as ants) serve as food.
Of course, a number of hymenopterans can be pests and even dangerous, whether from the venomous stings or damaging trees. However, as a order of insects, they greatly add to the diversity in nature and enhance human enjoyment of nature.