Give an example of a niche

A shallow recess, especially one in a wall to display a statue or other ornament.

A garden spider is a predator that hunts for prey among plants, The role that a species plays is called its niche. So the spiders niche (role) is hunt for prey among the plants. Maybe a better example is a Bee is an insect that pollinates flowers. The bee's niche is to pollinate