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+A function in the kernel that allows guests with internal/private IPs to access the internet by using the hosts' public IP similar to 1 to many NAT.
+
+Differences with Proxy, IP Masq, NAT:
+
+**Proxy**
+Requires special configuration on internal client side. Can be used for caching.
+
+**IP Masq**
+A form of NAT used primarily in Linux devices. Translates IP address and uses the connection tracking table and ports to map responses back to the internal connection.
+
+**NAT**
+Has different types with different use-cases.
+Static NAT: 1-1 mapping of pub/private IP. Dynamic NAT: pool of pub ips to dynamically map private IPs to based on availability. 
+PAT (Port): similar to IP Masq; 1-many using ports.
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