The term “firewall” encompasses a key component of network security, acting as a barrier between trusted internal networks and untrusted external networks. It filters incoming and outgoing traffic based on predetermined security rules, helping to prevent unauthorized access. Firewalls can be implemented in hardware, software, or a combination of both and are essential for protecting sensitive data from cyber threats. By monitoring and controlling network traffic, firewalls play a critical role in maintaining the integrity and confidentiality of information within an organization.