Litter is when people throw away things like candy wrappers, drink cans, pieces of paper and other trash instead of putting it in a trash can. Litter makes our neighborhoods look messy and can make them smell bad. It also can hurt animals like birds and turtles if they eat it or get tangled up in it. Litter can even pollute our water and air which can make people and animals sick. So it's important to always put your trash in the trash can and not leave it on the ground.