What is a firewall primarily used for in cybersecurity?

A firewall is primarily used in cybersecurity to detect and prevent unauthorized access to or from a private network. Its main function is to act as a security barrier between trusted internal networks and untrusted external networks, such as the internet. By doing so, it helps to monitor incoming and outgoing traffic and enforce security policies based on predetermined rules. This functionality is crucial for protecting sensitive data and resources from cyber threats such as unauthorized access, malware, and viruses.

A firewall can allow or block traffic based on specific criteria, which can include IP addresses, protocols, and port numbers. This capability helps organizations to maintain the integrity and confidentiality of their data while ensuring that legitimate traffic is allowed through. Overall, the role of a firewall is central to a comprehensive cybersecurity strategy, making it a fundamental component in safeguarding network environments.