Many routers come with hardware support built in to protect your connection from those attempting to hack or disrupt your service. Many netgear routers come with firewall support built in, as do buffalo and D link router equipment.
It is the general consensus that you should complement your firewall program by installing a hardware firewall. This is a firewall that is built into a router or stand-alone device. It often provides greater protection than a software-based firewall.
Usually software but some hardware firewall devices are produced.
NAT IS A FIREWALL -- inside a router and when on you have a hardware firewall protecting you
backup
No
No
A firewall can be either hardware or software
firewall is a hardware or software solution to enforce security policies. In the physical security analogy,
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I think firewalls can be both software and hardware. When you buy computers, it will usually always come with a limited time only antivirus and firewall.
A peice of hardware of software that blocks internet or network traffic is called a Firewall.
You are describing a firewall, usually part of a combo firewall/router. Many are hardware appliances, but there is always software involved...