Pollination is simply the transfer of pollen grains
from the anther of a flower to the stigma part of
the flower.

Honey bees travel from flower to flower, collecting
nectar (later converted to honey), and pollen
grains. The bee collects the pollen by rubbing
against the anthers. The pollen collects on the
hind legs, in dense hairs referred to as a pollen

As the bee flies from flower to flower, some of the
pollen grains are transferred onto the stigma of
other flowers.
Although insects are responsible for the majority of pollen being transferred, pollinations
occurs in other ways.  Creatures other than insects seeking nectar, like birds and bats, can
also transfer pollen.  Wind and water are other sources of pollination.

For more information on types of pollination click
For many plants, the production of
seeds that will grow depends on the
transfer of pollen from one flower to
another flower of the same kind.

Almost 90% of all flowering plants rely
on animal pollinators.
Most pollination occurs when
insects and other creatures brush
against the pollen-bearing parts
of a flower and pick up pollen.  
When the creature goes to
another flower for more food,
some of the pollen from the first
flower sticks to the second
flower.  In this way, the flowers
are pollinated.