What is NAT?
NAT is Network Address Translation. NAT is usually used to translate from real/global/public Internet addresses to inside/local/private addresses. These private addresses are usually RFC1918 IP addresses (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16).
NAT provides some security for your network as you do not have a real Internet IP address and your network, usually, cannot be accessed from the Internet without some outbound connection first being created from your private/inside network.
However, you still need a firewall to protect your network as NAT only hides your network but doesn't really stop any packets from entering your network.
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