Explain How does NAT/PAT work?

NAT : Short for Network Address Translation, an Internet standard that enables a local-area network (LAN) to use one set of IP addresses for internal traffic and a second set of addresses for external traffic.

PAT : Short for port address translation, a type of network address translation. During PAT, each computer on LAN is translated to the same IP address, but with a different port number assignment.

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NAT means Network Address Translation , NAT helps the Private IP to route over the public Internet, its translate private IP to a public IP by one to one or many to one, PAT means Port Address Translation ,its translate based on source port