A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and an untrusted external network, such as the Internet.
Firewalls are often categorized as either network firewalls or host-based firewalls.
Network-based firewalls are positioned on the gateway computers of LANs, WANs, and intranets. They are either software appliances running on general-purpose hardware or hardware-based firewall computer appliances. Firewall appliances may also offer other functionality to the internal network they protect, such as acting as a DHCP or VPN.
Host-based firewalls run on host computers and control network traffic in and out of those machines. The host-based firewall may be a daemon or service as a part of the operating system or an agent application such as endpoint security or protection. Each has advantages and disadvantages. However, each has a role in layered security.
What does a firewall protect against?
The main reason to install a firewall is to protect your personal computer and private network against malicious software such as viruses. Through an internet connection or Wi-Fi network, cybercriminals could find entry to your computer, but firewalls block unauthorized connections such as these and let you choose which programs can access the internet.
If you have multiple computers or devices connected in your home or office network, protect them with a hardware firewall for your router to protect your network and a software firewall that prevents the spread of malware in the event one of your computers is infected. Installing an antivirus solution for IoT is also a good idea.
Antivirus with firewall exists to protect your network and computers from such infections that come via the internet, so choose one of the best antiviruses with firewall for your personal computer.