NAT (Network Address Translation)
Network Address Translation
A technology that rewrites an internet address (an IP address) into a different address.
In Simple Terms
NAT is a technology that automatically rewrites an "IP address" — the address used on a network — into a different IP address. It's mainly used to convert the private addresses used inside a company or home into the global addresses needed for the internet. Devices like routers handle this conversion, making it possible for different networks to communicate with each other.
Behind the Name
NAT stands for "Network Address Translation." As the name suggests, it "translates" addresses used on a network — converting them from one form to another — much like translating language converts words while keeping their meaning intact.
Take a Closer Look!
NAT is a technology that rewrites an address called an "IP address," used on networks, into a different IP address.
Broadly speaking, its role is to convert between "global IP addresses" — the ones usable on the internet — and "private IP addresses," which are used only within an organization or home network.
Normally, every device that connects directly to the internet needs its own globally unique "global IP address." But if too many devices try to connect, there aren't enough of these globally shared addresses to go around. NAT and similar technologies solve this by converting the many addresses used internally into a limited pool of internet-facing addresses to handle communication.
This makes it possible for many devices to connect to the internet while making efficient use of a limited number of addresses. It also has a security benefit: since the real addresses of devices inside the network aren't directly visible from the outside world, this helps improve security.