Pollen is produced from the male organs of a flower. This includes the stamen, which contains the anther and filament. In order for plants to reproduce, they must be pollinated by something or by themselves. The pollen contains the gametophytes that produce the gametes, or the sperm cells. It has a harder outer covering and eventually lands on the pistil of a flower in order to pollinate it. As you can see in the picture, the several stamen present have yellow pollen grains on them, awaiting the wind or a pollinator to take it.