Firewall, as the name suggests can be thought of as a protective barrier around your system whose purpose is to block and keep out any malicious attacks from foreign viruses or any attempts at forced access to your secure files. There are a number of scammers, viruses and unwanted threats on the Internet today which, if given access could wreak havoc on your personal files and gain valuable information about you. To protect yourself from these, a strong firewall is essential.