What is a firewall and why do I need one?

A firewall is a network security device that acts as a barrier between an internal network and the outside world, typically the internet. It monitors and controls both incoming and outgoing network traffic based on predetermined security rules. Firewalls examine the data packets entering or leaving the network and decide whether to allow or block them. A firewall is essential for network security because it creates a protective shield against unauthorized access and cyber threats. It acts as the first line of defense by preventing malicious traffic from reaching your network and compromising sensitive data. Firewalls also help in preventing the spread of malware, viruses, and other malicious software by filtering out potentially harmful content. By implementing a firewall, you can gain better control over network traffic, enhance data privacy and integrity, and minimize the risk of security breaches and unauthorized access.