Round ball or can look like a egg, with spikes on it so it gets stuck to what touches it such as a bee leg, bird feathers or animal fur or pretty much whatever touches it and fall off when something bumps it.
If we didn't have any pollen in the world we wouldn't have many of the plants we have today.
Like males there are sperm in the male pollen cells and when the male pollen cells fall off and hit another plant cell the sperm comes of the pollen cell and fertilizes the egg in the plant cell thats how plants reproduce.