What is the concept of firewalls in network security?

What is the concept of firewalls in network security?

The concept of firewalls in network security is to act as a barrier between an internal network and external networks, such as the internet. Firewalls are designed to monitor and control incoming and outgoing network traffic based on predetermined security rules. They help to prevent unauthorized access, protect against malicious activities, and ensure the confidentiality, integrity, and availability of the network and its resources. Firewalls can be implemented as hardware devices, software applications, or a combination of both.