Types of firewall
Firewall software installed on the pc or laptop is generally referred to as personal or client firewall. Some antivirus software packages offers an integrated firewall edition. This protects the computer from being attacked over the internet by hackers, viruses, worms and scans incoming emails and attachments.
Generally, a hardware firewall which integrates to the internet router or modem is called as network or appliance firewall. Some SOHO routers come with a basic inbuilt firewall but for a really secure network, a business grade hardware firewall device should be used.