Nectar
Nectar, in botany, a sweet, sugary liquid secreted by flowers from glands, called nectaries, located at the base of the corollas and petals. Nectar is composed of simple sugars, chiefly sucrose, glucose, and fructose. It is eaten by hummingbirds, moths, and butterflies. Nectar is the raw material from which bees make honey.
In trying to reach the nectaries, the birds and insects come in contact with pollen, which adheres to their bodies. The pollen is carried to other flowers and, when deposited, causes cross-pollination.