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Routers and Gateways
A gateway is a network node that serves as an access point to another network, often involving not only a change of addressing, but also a different networking technology. More narrowly defined, a router merely forwards packets between networks with different network prefixes.
What do they have in common?
Both devices are used to regulate network traffic between two or more separate networks.
What's the difference?
Gateways regulate traffic between two dissimilar networks, while routers regulate traffic between similar networks.