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Network Address Translation (NAT) and Port Address Translation (PAT) both map IP addresses on an internal network to IP addresses on an external network. Which method of address translation you use depends on the types of networks that you are translating and the number of available IP addresses that you have.
PAT or Port Address Translation is a type of NAT that maps multiple private ip addresses to a single public ip address by using different ports .PAT is also called NAT overloading
