What is a Firewall?

Firewall refers to a network security device or software used to secure networks that monitor and regulate incoming and outgoing network traffic per pre-established security rules. To stop unauthorized access, harmful attacks, and the spread of malware, it serves as a barrier between internal networks and the internet by filtering traffic. To safeguard the network infrastructure and the systems connected to it, firewalls can be hardware appliances or software programs that scan network packets, block suspicious or malicious traffic, and enforce security regulations.