Why You Need A PC Firewall

A good explanation of PC Firewall Need Can be Found on official website of PC Firewall Software named 'ZoneAlarm' mean 'ZoneAlarm by CheckPoint.

As Per Their Front Page:

Connecting to the Internet is like opening a door to your computer. Through that door, you can easily go online to shop, read the latest news, send e-mail, and more. But an open door also allows hackers to easily gain access to your PC.

Once inside, hackers can steal your valuable personal data, such as bank account numbers and passwords. Your PC can be used without your knowledge to launch attacks on other computers, even on entire networks. A hacker can render your computer useless—to everyone except the hacker.

To protect yourself from hacker attacks, you need a PC firewall. In effect, a PC firewall shuts your computer's door to hackers, allowing only authorized traffic to flow through. antivirus software protects you from known viruses and can help clean up after a virus attack. But only a PC firewall can block unauthorized access to your Internet-connected computer and protect against both known and unknown malicious software and Internet threats. At the same time, a PC firewall allows your computer complete, unrestricted access to the Internet.