Pollination is when pollen from one flower lands on the stigma of another flower on the same type of tree. Pollen has the necessary building blocks for plants to create fruit. When the pollen from one tree's flowers lands on the stigma of another tree's flowers, it helps the two trees create fruit together. Think of it like two friends (the flowers) high-fiving, so now they can work together to create something even better (a fruit)!