A Firewall acts as a barrier between trusted systems and potentially unsafe network traffic. By inspecting incoming and outgoing connections, it can enforce security policies and restrict access to specific ports, protocols, applications, or IP addresses. Modern firewalls may also provide advanced functions such as application filtering, intrusion prevention, and traffic analysis. Choosing suitable firewall rules is essential for balancing security with reliable network access. Discover different Firewall types, features, and use cases in the detailed article.