Firewall

A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, by analyzing data packets to determine whether they should be allowed or blocked. Setting up a firewall involves defining rules that specify which ports, protocols, and IP addresses are permitted to communicate with your infrastructure, effectively minimizing the surface area for potential unauthorized access.