What is a 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 protect against cyber threats. Firewalls can be implemented as hardware devices, software programs, or a combination of both.

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 trusted and untrusted networks, protecting a computer system or network from unauthorized access, malware, and other cyber threats. Firewalls work by analyzing network traffic and deciding whether to allow or block it based on predefined security rules. They can be implemented as hardware devices, software applications, or a combination of both. Firewalls can be configured to allow or deny specific types of traffic, such as web browsing, email, or file transfers. They also can be used to control access to specific websites or services. Firewalls are an essential component of network security, and they play a vital role in protecting computer systems and networks from cyber threats.