A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predefined security rules. It acts as a barrier between trusted internal networks and untrusted external networks, helping prevent unauthorized access and cyberattacks.
In cybersecurity, firewalls are used to filter traffic, block malicious requests, and protect systems from threats such as hackers, malware, and unauthorized connections. They can be implemented as hardware, software, or a combination of both.
For example:
- A company uses a firewall to block suspicious traffic from external sources.
- A personal computer firewall prevents unauthorized applications from accessing the internet.
- A web server firewall protects a website from DDoS attacks.
- A school network restricts access to unsafe websites using firewall rules.
Common technologies and concepts related to firewalls include:
- Network Security
- Packet Filtering
- Proxy Servers
- Intrusion Prevention Systems (IPS)
- Access Control Rules
- VPN (Virtual Private Network)
- Malware Protection
- Cybersecurity Policies
- Network Monitoring