Simplify the following text for a Grade 13 native English-speaking person.
Original: In computer networking , network address translation ( NAT ) is a technique of modifying the network address information in the IP packet headers while transferring the packet across a traffic routing device , such technique remaps a given address space into another address space .
Simplified: In computer networking , network address translation ( NAT ) is the process of modifying IP address information in IP packet headers while in transit across a traffic routing device .