First there are the petals. They're held together at the base by the sepals. At the very center of the flower is the female part called the pistil. Surrounding the pistil are the male parts called the stamens. The stamens are responsible for making pollen.
Pollen is a yellow, powdery dust.
At the bottom of the pistil is the ovary containing eggs, When those eggs are fertilized with pollen, they form seeds. The ovary then develops into fruit. The process of moving pollen from the male parts of plants to the female parts is called pollination. It would be easy if a plant pollinated itself, but with most plants that's not how it works. They need help from mother nature.