Why did people need an Anderson air raid shelter?

People needed an Anderson air raid shelter during World War II to protect themselves from enemy air raids, particularly from bombings. These shelters were designed to be constructed in backyards, providing families with a safe space to take cover during attacks. Made of corrugated steel, they could withstand bomb blasts and were crucial for civilian safety as cities faced increased aerial bombardment. The government encouraged their use to minimize casualties and provide a sense of security to the public.