Firewall
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access and cyber threats. Firewalls can be implemented as hardware devices, software applications, or cloud-based services, and they are fundamental to securing modern IT infrastructure.
Developers should learn about firewalls to secure applications and systems by controlling network access, preventing data breaches, and complying with security standards. This is crucial for building and deploying web applications, APIs, and cloud services, where firewalls help mitigate attacks like DDoS, SQL injection, and unauthorized intrusions. Understanding firewall configuration is essential for roles in DevOps, cybersecurity, and backend development to ensure robust network protection.