Simply put, network address translation (nat) converts a private IP address such as 10.14.115.25 to a public IP address. Typically, network address translation is done by a router or modem on the edge of your network for traffic between an external system (e.g. from the Internet) and your internal private network.
Use the show ip nat translations to view the NAT table in IOS.
R1> enable R1# show ip nat translations . . .