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A default gateway is the device — usually a router — that traffic gets sent to when its destination isn't on the local network.
Why It's Necessary
Devices on a local network can talk to each other directly, but reaching anything outside (like a website) requires a gateway to route that traffic onward.
A Simple Analogy
Think of it as the exit door of a building — mail addressed within the building goes directly to the right room, but anything else has to go through that one door first.
