What pollination is

The process by which the mature pollen of a flower is deposited on the stigma of a flower of the same species is called pollination.

The male gamete cannot walk. It is a grain of pollen sitting inside an anther, and the female gamete it must reach is an ovule sealed inside an ovary — sometimes on another plant entirely. Pollination is the first half of solving that problem: getting the pollen onto the right stigma. The second half, travelling from the stigma down to the ovule, comes two pages into the next section.