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It's a great opportunity to find out what you need ... " covers this in more detail, but the bottom line is that a firewall primarily protects you from certain classes of incoming network-based problems.
Every computer should be behind a firewall of some sort.
In general, hardware firewalls, typically provided by NAT routers, keep malicious network traffic from ever reaching your computer, whereas software firewalls, such as the Windows Firewall, discard malicious traffic after it has actually arrived at your computer. If you have a router with network address translation, or NAT, enabled (most consumer grade routers do, by default) then there's no need to enable the Windows firewall.
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