There are many correct answers to this question as littering has many effects. It effects not just us as humans, but it also impacts animals and our Earth. Littering is when trash is improperly disposed. This can include appliances, paper, boxes, and cigarettes, but there are thousands of other things that can be improperly disposed of.
Things that are littered must go to a landfill and it takes a long time to clean it up. Landfills are an eyesore and we are taxed for the cleanup. Litter can also end up in the water, posioning the water and animals that live there.