What does firewall software do?

Answer 1

The firewall controls what programs can access the internet and what programs from the internet can access the computer

what is a firewall ?How does it work?

http://computer.howstuffworks.com/computer-internet-security-channel.htm

Is a security program which protects your computer from unauthorized access through the Internet. It resides on your PC and filters traffic coming and going from your computer

http://www.Microsoft.com/protect/computer/firewall/faq.mspx

Answer 2

A Firewall is a program or device that acts as a barrier to keep destructive elements out of a network or specific computer. Firewalls are configured (in hardware, software, or both) with specific criteria to block or prevent unauthorized access to a network. There are many firewall in the network and here below are the following

1. Comodo Firewall - personalfirewall.comodo.com/

2. Zone alarm

Answer 3

A firewall software is used to protect a computer or network by analyzing data coming in and going out for threats. It can protect against threats like worms or trojans.