Software firewalls are said to be the most popular firewall of choice for most individual home users due to its easy-to-use security features. Like any software, software firewalls are installed on your PC and can be customized and configured according to your security preference. Any outside attempt to access or control your PC will be blocked based on the security settings of your software firewall and you can also get protection against the most common Trojan and e-mail worms. Users can set user defined controls in order to ensure safe file and printer sharing and to prevent unsafe applications from running on your PC. However, software firewalls can only protect the computer on which they are installed so each computer on a network must have its own software firewall in order to get protected.