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Definitions of network address port translation:

NAPT is a special case of NAT, where many IP numbers are hidden behind a number of addresses, but in contrast to the original NAT this does not mean there can be only that number of connections at a time. In NAPT an almost arbitrary number of connections is multiplexed using TCP port information. The number of simultaneous connections is limited by the number of addresses multiplied by the number of TCP ports available.
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In computer networking, network address translation (NAT, also known as network masquerading or IP-masquerading) is a technique in which the source and/or destination addresses of IP packets are rewritten as they pass through a router or firewall. It is most commonly used to enable multiple hosts on a private network to access the Internet using a single public IP address. According to specifications, routers should not act in this way, but it is a convenient and widely-used technique. ...
en.wikipedia.org/wiki/Network_address_port_translation