A fire wall is a protective barrier designed to prevent the spread of fire between different sections of a building. It is typically made of non-combustible materials and extends from the foundation to the roof, creating a fire-resistant separation. This helps to contain flames and smoke, allowing occupants more time to evacuate and reducing damage to property. In addition to physical structures, fire walls can also refer to software systems that protect computer networks. These digital fire walls monitor and control incoming and outgoing network traffic based on predetermined security rules, helping to prevent unauthorized access and cyber threats.