What do fire doors prevent?

Fire doors are specifically designed to enhance the safety of a building by preventing the spread of fire and smoke from one area to another. They are constructed with materials that are resistant to high temperatures and are equipped with features such as self-closing mechanisms and tight seals. These characteristics ensure that, in the event of a fire, the door can effectively contain the flames and toxic smoke, allowing more time for occupants to evacuate and for fire services to respond. This containment is crucial for maintaining safe egress paths and protecting other areas of the structure from fire damage. Hence, the primary purpose of fire doors aligns with the prevention of fire and smoke movement within a building, making this answer the correct choice.