What function do firewalls serve in information security?

Firewalls play a critical role in information security by acting as a barrier between trusted and untrusted sources. Their primary function is to control the flow of incoming and outgoing network traffic based on predetermined security rules. By doing this, firewalls help protect networks from unauthorized access, cyber attacks, and various online threats. They monitor data packets flowing in and out of a network, allowing only those that meet specific security criteria while blocking potentially harmful traffic.

The importance of this function cannot be overstated. Without firewalls, sensitive information and resources on trusted networks would be at significant risk from external threats attempting to exploit vulnerabilities. By maintaining a secure boundary, firewalls help ensure that networks can operate safely, enabling organizations to enforce policies that dictate which data can enter or leave their systems. This functionality is essential in comprehensive cybersecurity strategies.