The Broken Windows Theory proposes that signs of crime, anti-social behavior, and civil disorder create an urban environment that encourages further crime. This includes broken windows, litter, and other signs of neglect that create the perception that no one cares. If left unaddressed, this leads to urban decay and a downward spiral where serious crime becomes more common. The theory recommends fixing issues like broken windows and cleaning up litter and graffiti to address disorder and prevent crime before it escalates.